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@article{faucris.247446162,
abstract = {A new Ru complex with the formula [Ru(bpn)(pic)(2)]Cl-2 (where bpn is 2,2 '-bi(1,10-phenanthroline) and pic stands for 4-picoline) (1Cl(2)) is synthesized to investigate the true nature of active species involved in the electrochemical and chemical water oxidation mediated by a class of N4 tetradentate equatorial ligands. Comprehensive electrochemical (by using cyclic voltammetry, differential pulse voltammetry, and controlled potential electrolysis), structural (X-ray diffraction analysis), spectroscopic (UV-vis, NMR, and resonance Raman), and kinetic studies are performed. 1(2+) undergoes a substitution reaction when it is chemically (by using NaIO4) or electrochemically oxidized to Ru-III, in which picoline is replaced by an hydroxido ligand to produce [Ru(bpn)(pic)(OH)](2+) (2(2+)). The former complex is in equilibrium with an oxo-bridged species {[Ru(bpn)(pic)](2)(mu-O)}(4+) (3(4+)) which is the major form of the complex in the Ru-III oxidation state. The dimer formation is the rate determining step of the overall oxidation process (k(dimer) = 1.35 M-1 s(-1)), which is in line with the electrochemical data at pH = 7 (k(dimer) = 1.4 M-1 s(-1)). 3(4+) can be reduced to [Ru(bpn)(pic)(OH2)](2+) (4(2+)), showing a sort of square mechanism. All species generated in situ at pH 7 have been thoroughly characterized by NMR, mass spectrometry, UV-Vis and electrochemical techniques. 1(2+) and 4(2+) are also characterized by single crystal X-ray diffraction analysis. Chemical oxidation of 1(2+) triggered by Ce-IV shows its capability to oxidize water to dioxygen.},
author = {Ghaderian, Abolfazl and Franke, Alicja and Gil-Sepulcre, Marcos and Benet-Buchholz, Jordi and Llobet, Antoni and Ivanovic-Burmazovic, Ivana and Gimbert-Surinach, Carolina},
doi = {10.1039/d0dt03548c},
faupublication = {yes},
journal = {Dalton Transactions},
note = {CRIS-Team WoS Importer:2021-01-01},
pages = {17375-17387},
peerreviewed = {Yes},
title = {{A} broad view on the complexity involved in water oxidation catalysis based on {Ru}-bpn complexes},
volume = {49},
year = {2020}
}
@article{faucris.120799844,
abstract = {Because of the increased insight into the biological role of hydrogen peroxide (H2O2) under physiological and pathological conditions and the role it presumably plays in the action of natural and synthetic redox-active drugs, there is a need to accurately define the type and magnitude of reactions that may occur with this intriguing and key species of redoxome. Historically, and frequently incorrectly, the impact of catalase-like activity has been assigned to play a major role in the action of many redox-active drugs, mostly SOD mimics and peroxynitrite scavengers, and in particular MnTBAP3- and Mn salen derivatives. The advantage of one redox-active compound over another has often been assigned to the differences in catalase-like activity. Our studies provide substantial evidence that Mn(III) N-alkylpyridylporphyrins couple with H2O2 in actions other than catalase-related. Herein we have assessed the catalase-like activities of different classes of compounds: Mn porphyrins (MnPs), Fe porphyrins (FePs), Mn(III) salen (EUK-8), and Mn(II) cyclic polyamines (SOD-active M40403 and SOD-inactive M40404). Nitroxide (tempol), nitrone (NXY-059), ebselen, and MnCl2, which have not been reported as catalase mimics, were used as negative controls, while catalase enzyme was a positive control. The dismutation of H2O2 to O2 and H2O was followed via measuring oxygen evolved with a Clark oxygen electrode at 25°C. The catalase enzyme was found to have kcat(H2O2)=1.5×106 M-1 s-1. The yield of dismutation, i.e., the maximal amount of O2 evolved, was assessed also. The magnitude of the yield reflects an interplay between the kcat(H2O2) and the stability of compounds toward H2O2-driven oxidative degradation, and is thus an accurate measure of the efficacy of a catalyst. The kcat(H2O2) values for 12 cationic Mn(III) N-substituted (alkyl and alkoxyalkyl) pyridylporphyrin-based SOD mimics and Mn(III) N,N′-dialkylimidazolium porphyrin, MnTDE-2-ImP5+, ranged from 23 to 88 M-1 s-1. The analogous Fe(III) N-alkylpyridylporphyrins showed ∼10-fold higher activity than the corresponding MnPs, but the values of kcat(H2O2) are still ∼4 orders of magnitude lower than that of the enzyme. While the kcat(H2O2) values for Fe ethyl and n-octyl analogs were 803.5 and 368.4 M-1 s-1, respectively, the FePs are more prone to H2O2-driven oxidative degradation, therefore allowing for similar yields in H2O2 dismutation as analogous MnPs. The kcat(H2O2) values are dependent on the electron deficiency of the metal site as it controls the peroxide binding in the first step of the dismutation process. SOD-like activities depend on electron deficiency of the metal site also, as it controls the first step of O2•- dismutation. In turn, the kcat(O2•-) parallels the kcat(H2O2). Therefore, the electron-rich anionic non-SOD mimic MnTBAP3- has essentially very low catalase-like activity, kcat(H2O2)=5.8 M-1 s-1. The catalase-like activities of Mn(III) and Fe(III) porphyrins are at most, 0.0004 and 0.05% of the enzyme activity, respectively. The kcat(H2O2) values of 8.2 and 6.5 M-1 s-1 were determined for electron-rich Mn(II) cyclic polyamine-based compounds, M40403 and M40404, respectively. The EUK-8, with modest SOD-like activity, has only slightly higher kcat(H2O2)=13.5 M-1 s-1. The biological relevance of kcat(H2O2) of MnTE-2-PyP5+, MnTDE-2-ImP5+, MnTBAP3-, FeTE-2-PyP5+, M40403, M40404, and Mn salen was evaluated in wild-type and peroxidase/catalase-deficient E. coli.},
author = {Tovmasyan, Artak and Maia, Clarissa G.C. and Weitner, Tin and Carballal, Sebastian and Sampaio, Romulo S. and Lieb, Dominik and Ghazaryan, Robert and Ivanovic-Burmazovic, Ivana and Ferrer-Sueta, Gerardo and Radi, Rafael and Reboucas, Julio S. and Spasojevic, Ivan and Benov, Ludmil and Batinic-Haberle, Ines},
doi = {10.1016/j.freeradbiomed.2015.05.018},
faupublication = {yes},
journal = {Free Radical Biology and Medicine},
pages = {308-321},
peerreviewed = {unknown},
title = {{A} comprehensive evaluation of catalase-like activity of different classes of redox-active therapeutics},
volume = {86},
year = {2015}
}
@article{faucris.120799404,
abstract = {The reaction of a manganese(V)-oxo porphyrinoid complex with the Lewis acid B(CF) leads to reversible stabilization of the valence tautomer Mn(O)(π-radical cation). The latter complex, in combination with B(CF), reacts with ArO-H substrates via formal hydrogen-atom transfer and exhibits dramatically increased reaction rates over the Mn(O) starting material. © 2014 American Chemical Society.},
author = {Baglia, Regina A. and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Goldberg, David P.},
doi = {10.1021/ic500901y},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {5893-5895},
peerreviewed = {No},
title = {{Activation} of a high-valent manganese-oxo complex by a nonmetallic lewis acid},
volume = {53},
year = {2014}
}
@article{faucris.201110966,
author = {Yu, Meng and Ward, Meghan B. and Franke, Alicja and Ambrose, Stephen L. and Whaley, Zachary L. and Bradford, Thomas Miller and Gorden, John D. and Beyers, Ronald J. and Cattley, Russell C. and Ivanovic-Burmazovic, Ivana and Schwartz, Dean D. and Goldsmith, Christian R.},
doi = {10.1021/acs.inorgchem.6b02964},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {2812-2826},
peerreviewed = {Yes},
title = {{Adding} a {Second} {Quinol} to a {Redox}-{Responsive} {MRI} {Contrast} {Agent} {Improves} {Its} {Relaxivity} {Response} to {H2O2}},
volume = {56},
year = {2017}
}
@article{faucris.120213104,
abstract = {Background: The question of whether novel instruments such as multiple electrode aggregometry (MEA) can be used for measurement of the effects of nitric oxide (NO) on platelets (PLTs) has not been examined. Methods: Therefore, we compared the effects of NO concentrations (1, 10, and 100 μM) on the PLT aggregation response to ADP, arachidonic acid (AA), collagen, ristocetin, and thrombin receptor-activating peptide 6 (TRAP-6) using light transmission aggregometry (LTA) and multiple electrode aggregometry (MEA) and examined the effects of NO using the platelet function analyzer (PFA)-100™. Results: The response of PLTs to ADP and AA was strongly inhibited by all NO concentrations in LTA and MEA. The inhibition of the responses to ristocetin and collagen was detectable in MEA at lower NO concentrations than in LTA. However, the typically increasing lag phase between collagen addition and the aggregation response in the presence of NO was more obvious in LTA. TRAP caused a reproducible early response in the presence of NO in LTA which was followed by rapid PLT disaggregation, whereas even 100 μM NO did not inhibit the response to TRAP in MEA. Finally, NO prolonged the in-vitro bleeding time remarkably more in the PFA-100 collagen-epinephrin cartridge than in the collagen-ADP cartridge. Conclusions: Whole blood versus PLT rich plasma, citrate versus hirudin, and high versus low shear influenced the effects of NO. This shows that a careful selection of models and potentially a combination of different methods is appropriate for a differentiated evaluation of pharmacological or physiological mechanisms of NO-donors or of NO-inhibitors.},
author = {Zimmermann, Robert and Krüger, Julia and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and Calatzis, Andreas and Eckstein, Reinhold and Weiss, Dominik R.},
doi = {10.7754/Clin.Lab.2012.120601},
faupublication = {yes},
journal = {Clinical Laboratory},
pages = {629-638},
peerreviewed = {Yes},
title = {{A} detailed examination of platelet function inhibition by nitric oxide in platelet-rich plasma and whole blood},
volume = {59},
year = {2013}
}
@article{faucris.121240064,
abstract = {A detailed mechanistic study of the substitution behavior of a 3d metal heptacoordinate complex, with a rare pentagonal-bipyramidal structure, was undertaken to resolve the solution chemistry of this system. The kinetics of the complex-formation reaction of [Fe(dapsox)(HO)]ClO (Hdapsox = 2,6-diacetylpyridine-bis(semioxamazide)) with thiocyanate was studied as a function of thiocyanate concentration, pH, temperature, and pressure. The reaction proceeds in two steps, which are both base-catalyzed due to the formation of an aqua-hydroxo complex (pK = 5.78 ± 0.04 and pK = 9.45 ± 0.06 at 25 °C). Thiocyanate ions displace the first coordinated water molecule in a fast step, followed by a slower reaction in which the second thiocyanate ion coordinates trans to the N-bonded thiocyanate. At 25 °C and pH <4.5, only the first reaction step can be observed, and the kinetic parameters (pH 2.5: k = 2.6 ± 0.1 M s, ΔH = 62 ± 3 kJ mol, ΔS = -30 ± 10 J K mol, and ΔV = -2.5 ± 0.2 cm mol) suggest the operation of an I mechanism. In the pH range 2.5 to 5.2 this reaction step involves the participation of both the diaqua and aqua-hydroxo complexes, for which the complex-formation rate constants were found to be 2.19 ± 0.06 and 1172 ± 22 M s at 25 °C, respectively. The more labile aqua-hydroxo complex is suggested to follow an I or D substitution mechanism on the basis of the reported kinetic data. At pH ≥4.5, the second substitution step also can be monitored (pH 5.5 and 25 °C: k = 21.1 ± 0.5 M s, ΔH = 60 ± 2 kJ mol, ΔS = -19 ± 6 J K mol, and ΔV = +8.8 ± 0.3 cm mol, for which an I or D mechanism is suggested. The results are discussed in terms of known structural parameters and in comparison to relevant structural and kinetic data from the literature.},
author = {Ivanovic-Burmazovic, Ivana and Hamza, Mohamed and van Eldik, Rudi},
doi = {10.1021/ic0200803},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {5150-5161},
peerreviewed = {Yes},
title = {{A} detailed mechanistic study of the substitution behavior of an unusual seven-coordinate iron({III}) complex in aqueous solution},
volume = {41},
year = {2002}
}
@article{faucris.120213544,
abstract = {The complexes [(η -C R )Co( Pr Im)(η -C H )] (R = H 1; Me 2) were synthesized in good yields via reaction of one equivalent of the N-heterocyclic carbene Pr Im (R Im = 1,3-dialkylimidazolin-2-ylidene) and the bis(ethylene) complexes [(η -C R )Co(η -C H ) ]. These complexes serve as convenient starting materials for chemistry using the [(η -C R )Co( Pr Im)] complex fragment. The reaction with carbon monoxide leads to the carbonyl complexes [(η -C R )Co( Pr Im)(CO)] (R = H 3; Me 4) in good to excellent yields. The carbonyl complexes 3 and 4 are very air sensitive and react readily with oxygen in the solid state and in solution. Whereas the cyclopentadienyl-substituted complex [(η -C H )Co( Pr Im)(CO)] (3) decomposes upon reaction with O to intractable products, [(η -C Me )Co( Pr Im)(CO)] (4) yields the structurally characterized cobalt(III) carbonato complex [(η -C Me )Co( Pr Im)(κ -CO )] (5). This reaction represents the first example of O oxidation of a metal-bound carbonyl for a 3d transition metal complex. The oxidation is too fast to be monitored by NMR spectroscopy, and application of low-temperature time-resolved UV/vis spectroscopy combined with stopped-flow techniques led to the detection of a possible intermediate. On the basis of these experiments and computational investigations using density functional theory (DFT) the peroxo acyl complex [(η -C Me )Co( Pr Im)(κ -C,O-C{O}OO)] (B) is assumed to be the key intermediate detected. The DFT calculations further reveal that this reaction is strongly exothermic with two kinetic barriers, one for the exothermic addition of O to the carbonyl complexes 4 to give the peroxo acyl complex [(η -C Me )Co( Pr Im)(κ -C,O-C{O}OO)] (B), the other for the rearrangement of B to give the carbonato complex [(η -C Me )Co( Pr Im)(η -CO )] (5). The key step for the rearrangement is the formation of CO in the coordination sphere of cobalt and the attack of metal-bound oxygen at the carbon atom of CO . © 2012 American Chemical Society.},
author = {Dürr, Simon and Zarzycki, Bartosz and Ertler, Daniel and Ivanovic-Burmazovic, Ivana and Radius, Udo},
doi = {10.1021/om201037w},
faupublication = {yes},
journal = {Organometallics},
pages = {1730-1742},
peerreviewed = {Yes},
title = {{Aerobic} {CO} oxidation of a metal-bound carbonyl in a {NHC}-stabilized cobalt half-sandwich complex},
volume = {31},
year = {2012}
}
@article{faucris.121698544,
abstract = {The aggregation of phthalocyanines is well-known in solution but has never before been studied in the gas phase. We investigated the tetra-[18]crown-6 ether functionalized zinc-phthalocyanine (ZnPcTetCr, M) with electrospray ionization mass spectrometry (ESI-MS) in the absence of coordinating metal cations. Apart from the molecular ion M(+•), singly and multiply charged aggregates Mn(z(+•)) were observed, bound together by electrostatic interactions, without alkali metal cations inside the crown ethers. Collision-induced dissociation (CID) experiments indicate that these clusters consist of stacked neutral M and radical cations M(+•). After the oxidation of individual molecules at the electrospray needle, the aggregation occurs during desolvation of the charged droplets created in the source. Complete evaporation of the solvent and detection of the aggregates was found to require an additional acceleration of the droplets in the transfer region of the instrument, the resulting collisions with neutral gas assisting the desolvation process.},
author = {Kellner, Ina and Hahn, Uwe and Dürr, Maximilian and Torres, Tomas and Ivanovic-Burmazovic, Ivana and Drewello, Thomas},
doi = {10.1021/acs.jpca.5b08790},
faupublication = {yes},
journal = {Journal of Physical Chemistry A},
pages = {11454-60},
peerreviewed = {Yes},
title = {{Aggregation} of a {Crown} {Ether} {Decorated} {Zinc}-{Phthalocyanine} by {Collision}-{Induced} {Desolvation} of {Electrospray} {Droplets}.},
volume = {119},
year = {2015}
}
@article{faucris.120213984,
abstract = {Redox-inactive metal ions that function as Lewis acids play pivotal roles in modulating reactivities of oxygen-containing metal complexes in a variety of biological and biomimetic reactions, including dioxygen activation/formation and functionalization of organic substrates. Mononuclear nonheme iron(iii)-peroxo species are invoked as active oxygen intermediates in the catalytic cycles of dioxygen activation by nonheme iron enzymes and their biomimetic compounds. Here, we report mononuclear nonheme iron(iii)-peroxo complexes binding redox-inactive metal ions, [(TMC)Fe(O)] -M (M = Sc and Y ; TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane), which are characterized spectroscopically as a 'side-on' iron(iii)-peroxo complex binding a redox-inactive metal ion, (TMC)Fe-(μ, η:η-O)-M (2-M). While an iron(iii)-peroxo complex, [(TMC)Fe(O)], does not react with electron donors (e.g., ferrocene), one-electron reduction of the iron(iii)-peroxo complexes binding redox-inactive metal ions occurs readily upon addition of electron donors, resulting in the generation of an iron(iv)-oxo complex, [(TMC)Fe(O)] (4), via heterolytic O-O bond cleavage of the peroxide ligand. The rates of the conversion of 2-M to 4 are found to depend on the Lewis acidity of the redox-inactive metal ions and the oxidation potential of the electron donors. We have also determined the fundamental electron-transfer properties of 2-M, such as the reduction potential and the reorganization energy in electron-transfer reaction. Based on the results presented herein, we have proposed a mechanism for the reactions of 2-M and electron donors; the reduction of 2-M to the reduced species, (TMC)Fe-(O)-M (2′-M), is the rate-determining step, followed by heterolytic O-O bond cleavage of the reduced species to form 4. The present results provide a biomimetic example demonstrating that redox-inactive metal ions bound to an iron(iii)-peroxo intermediate play a significant role in activating the peroxide O-O bond to form a high-valent iron(iv)-oxo species. © 2013 The Royal Society of Chemistry.},
author = {Lee, Yong-Min and Bang, Suhee and Kim, Yun Mi and Cho, Jaeheung and Hong, Seungwoo and Nomura, Takashi and Ogura, Takashi and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Sarangi, Rikimukta and Fukuzumi, Shunichi and Nam, Wonwoo},
doi = {10.1039/c3sc51864g},
faupublication = {yes},
journal = {Chemical Science},
pages = {3917-3923},
peerreviewed = {Yes},
title = {{A} mononuclear nonheme iron(iii)-peroxo complex binding redox-inactive metal ions},
volume = {4},
year = {2013}
}
@article{faucris.120402964,
abstract = {Five newly functionalized pentaazamacrocyclic manganese complexes, with variable lengths and amounts of the aliphatic groups (three compounds with one linear chain containing 12, 16, and 22 carbon atoms, i.e., MnL1, MnL2, and MnL3, respectively, as well as two compounds containing two C12 and C16 chains, MnL4 and MnL5, respectively) that are derivatives of the known SOD mimetic, Mn(Me-Pyane), have been synthesized. These amphiphilic complexes were characterized by the ESI mass spectrometry, potentiometric titrations, light scattering, cyclic voltammetry, and direct stopped-flow determination of their SOD activity at pH 8.1 and 7.4 (in phosphate and HEPES buffers). The formation of supramolecular aggregates that predominantly exist in the solution as a defined micellar/nanostructure assembly, with an average 400 nm size, has been demonstrated for MnL1. The biological effects of the selected complexes (MnL1 and MnL2) on the superoxide level in cytosol and mitochondria have been tested, as well as their effects on the prevention of the lipid peroxidation induced by paraquat. Advantages and disadvantages of the lipophilic pentaazamacrocyclic manganese SOD mimetics in comparison to the corresponding nonsubstituted SOD active complex have been discussed. © 2013 American Chemical Society.},
author = {Lieb, Dominik and Kenkel, Isabell and Miljkovic, Jan and Moldenhauer, Daniel and Weber, Nadine and Filipovic, Milos and Gröhn, Franziska and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic402469t},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {1009-1020},
peerreviewed = {Yes},
title = {{Amphiphilic} pentaazamacrocyclic manganese superoxide dismutase mimetics},
volume = {53},
year = {2014}
}
@article{faucris.120214204,
abstract = {The title compound was prepared by a template synthesis from 2,6-diacetylpyridine, dioxamohydrazide and Fe(ClO) · 6HO (mol ratio 1: 2: 1) in MeOH/HO (3: 1) solution and its structure determined by single-crystal X-ray diffraction; triclinic, space group P1, a = 7.5186(7), b = 10.9730(9), c = 14.6110(10)Å, α = 95.866(1), β = 100.252(1) γ = 92.895(1), z = 2. The polydentate ligand is coordinated as a dianionic pentadentate while water molecules occupy apical positions in the structure. This is the first example of a monomeric, pentagonal bipyramidal structure of an Fe(III) complex with a dianionic bis(acylhydrazone) derivative of 2,6-diacetylpyridine.},
author = {Andjelkovic, K. and Bacchi, Alessia and Pelizzi, Giancarlo and Jeremic, D. and Ivanovic-Burmazovic, Ivana},
doi = {10.1080/0095897021000058600},
faupublication = {no},
journal = {Journal of Coordination Chemistry},
pages = {1385-1392},
peerreviewed = {Yes},
title = {{An} {Fe}({III}) complex with the dianionic form of 2,6-diacetylpyridine bis(acylhydrazone). {The} crystal structure of [diaqua-2′,2â´-(2,6-pyridinediyldiethylidyne)dioxamo-hydrazide] iron({III}) perchlorate trihydrate, [{Fe}(dapsox)({H2O})2]{ClO4}· {3H2O}},
volume = {55},
year = {2002}
}
@article{faucris.120214424,
abstract = {Synthesis and characterization of a manganese complex of a new redox-active diaminocyclohexane derivative of a thiourea-based ligand with SNNNS donor atom set is reported. The molecular structure of the complex exhibits a pentadentate SNNNS ligand coordinated in the neutral form to the Mn(II) center. The coordination around the central metal is best described as distorted trigonal bipyramidal with the pyridine nitrogen and the two sulfur atoms being in the equatorial plane and the remaining two nitrogen donors occupying the apical positions of the bipyramid. Cyclic voltammetry in DMSO shows the Mn /Mn redox couple with the oxidation peak at -0.199 V and the reduction peak at -0.587 V vs. Fc/Fc (scan rate 0.5 V s ). The ligand itself possesses redox activity and exhibits prominent oxidation and reduction peaks at -1.194 and -1.481 V vs. Fc/Fc , respectively. The results of electrochemical experiments under oxygen atmosphere suggest that upon reaction with electrochemically generated superoxide the redox-active ligand is modified causing decomposition of the complex. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.},
author = {Dürr, Katharina L. and Yalalov, Denis A. and Heinemann, Frank Wilhelm and Tsogoeva, Svetlana and Ivanovic-Burmazovic, Ivana},
faupublication = {yes},
journal = {Zeitschrift für Naturforschung Section B-A Journal of Chemical Sciences},
pages = {258-262},
peerreviewed = {Yes},
title = {{A} novel five-coordinate mn complex with a redox-active snnns ligand system},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-77953818013&origin=inward},
volume = {65},
year = {2010}
}
@article{faucris.235072675,
abstract = {A superoxide dismutase mimic (Mn1) was functionalized with three positively charged-peptides: RRRRRRRRR (Mn1-R9), RRWWWRRWRR (Mn1-RW9) or Fx-r-Fx-K (Mn1-MPP). Characterization of the physico-chemical properties of the complexes show that they share similar binding affinity for Mn2+, apparent reduction potential and intrinsic superoxide dismutase activity. However, their accumulation in cells is different (Mn1-R9 < Mn1-MPP < Mn1-RW9 < Mn1), as well as their subcellular distribution. In addition, the three functionalized-complexes display a better anti-inflammatory activity than Mn1 when assayed at 10 μM. This improvement is due to a combination of an anti-inflammatory effect of the peptidyl moiety itself, and of the SOD mimic for Mn1-RW9 and Mn1-MPP. In contrast, the enhanced anti-inflammatory activity of Mn1-R9 is solely due to the SOD mimic.},
author = {Mathieu, Emilie and Bernard, Anne Sophie and Ching, H. Y.Vincent and Somogyi, Andrea and Medjoubi, Kadda and Fores, Jennifer Rodon and Bertrand, Hélène C. and Vincent, Amandine and Trépout, Sylvain and Guerquin-Kern, Jean Luc and Scheitler, Andreas and Ivanovic-Burmazovic, Ivana and Seksik, Philippe and Delsuc, Nicolas and Policar, Clotilde},
doi = {10.1039/c9dt04619d},
faupublication = {yes},
journal = {Dalton Transactions},
note = {CRIS-Team Scopus Importer:2020-02-28},
pages = {2323-2330},
peerreviewed = {Yes},
title = {{Anti}-inflammatory activity of superoxide dismutase mimics functionalized with cell-penetrating peptides},
volume = {49},
year = {2020}
}
@article{faucris.263724229,
abstract = {Careful optimization of the reaction conditions provided access to the particularly small tetraruthenium macrocycle2 Ru2Ph-Croc, which is composed out of two redox-active divinylphenylene-bridged diruthenium entities {Ru}-1,4-CH=CH-C6H4-CH=CH-{Ru} (Ru2Ph; {Ru} = Ru(CO)Cl(PiPr3)2) and two likewise redox-active and potentially non-innocent croconate linkers. According to single X-ray diffraction analysis, the central cavity of2Ru2Ph-Croc is shielded by the bulky PiPr3 ligands, which come into close contact. Cyclic voltammetry revealed two pairs of split anodic waves in the weakly ion pairing CH2Cl2/NBu4BArF24 (BArF24 = [B{C6H3(CF3)2-3,5}4]-electrolyte, while the third and fourth waves fall together in CH2Cl2 / NBu4PF6. The various oxidized forms were electrogenerated and scrutinized by IR and UV/Vis/NIR spectroscopy. This allowed us to assign the individual oxidations to the metal-organic Ru2Ph entities within2Ru2Ph-Croc, while the croconate ligands remain largely uninvolved. The lack of specific NIR bands that could be assigned to intervalence charge transfer (IVCT) in the mono-and trications indicates that these mixed-valent species are strictly charge-localized.2Ru2Ph-Croc is hence an exemplary case, where stepwise IR band shifts and quite sizable redox splittings between consecutive one-electron oxidations would, on first sight, point to electronic coupling, but are exclusively due to electrostatic and inductive effects. This makes2Ru2Ph-Croc a true “pretender”.},
author = {Rotthowe, Nils and Linseis, Michael and Vogelsang, Lars and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Winter, Rainer F.},
doi = {10.3390/molecules26175232},
faupublication = {yes},
journal = {Molecules},
keywords = {Crystal structure; Electrochemistry; Metallamacrocycle; Redox splitting; Spectroelectrochemistry},
note = {CRIS-Team Scopus Importer:2021-09-10},
peerreviewed = {Yes},
title = {{A} “pretender” croconate-bridged macrocyclic tetraruthenium complex: {Sizable} redox potential splittings despite electronically insulated divinylphenylene diruthenium entities},
volume = {26},
year = {2021}
}
@article{faucris.120800504,
abstract = {Encapsulation of a manganese porphyrin in a self-assembled molecular cage allows catalytic epoxidation of various substrates in 1:1 water/acetonitrile mixtures. The cage acts as a phase-transfer catalyst and creates a protective environment for the catalyst improving the stability. The encapsulated catalyst also allows discrimination between styrene derivatives of various sizes. In a direct competition experiment, the selectivity of the epoxidation reaction could be inverted with respect to a benchmark catalyst.},
author = {Kuijpers, Petrus F. and Otte, Matthias and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H. and de Bruin, Bas},
doi = {10.1021/acscatal.6b00283},
faupublication = {yes},
journal = {ACS Catalysis},
keywords = {epoxidation; manganese; porphyrin; size-selective; supramolecular chemistry},
pages = {3106-3112},
peerreviewed = {unknown},
title = {{A} {Self}-{Assembled} {Molecular} {Cage} for {Substrate}-{Selective} {Epoxidation} {Reactions} in {Aqueous} {Media}},
volume = {6},
year = {2016}
}
@article{faucris.121242044,
abstract = {Hydrogen sulfide (HS) has been increasingly recognized as an important signaling molecule that regulates both blood pressure and neuronal activity. Attention has been drawn to its interactions with another gasotransmitter, nitric oxide (NO). Here, we provide evidence that the physiological effects observed upon the application of sodium nitroprusside (SNP) and HS can be ascribed to the generation of nitroxyl (HNO), which is a direct product of the reaction between SNP and HS, not a consequence of released NO subsequently reacting with HS. Intracellular HNO formation has been confirmed, and the subsequent release of calcitonin gene-related peptide from a mouse heart has been demonstrated. Unlike with other thiols, SNP reacts with HS in the same way as rhodanese, i.e., the cyanide transforms into a thiocyanate. These findings shed new light on how HS is understood to interact with nitroprusside. Additionally, they offer a new and convenient pharmacological source of HNO for therapeutic purposes. © 2013 American Chemical Society.},
author = {Filipovic, Milos and Eberhardt, Mirjam and Prokopovic, Vladimir and Mijuskovic, Ana and Orescanin-Dusic, Zorana and Reeh, Peter and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/jm3012036},
faupublication = {yes},
journal = {Journal of Medicinal Chemistry},
pages = {1499-1508},
peerreviewed = {Yes},
title = {{Beyond} {H2S} and {NO} interplay: {Hydrogen} sulfide and nitroprusside react directly to give nitroxyl ({HNO}). {A} new pharmacological source of {HNO}},
volume = {56},
year = {2013}
}
@article{faucris.121242704,
abstract = {The reaction of hydrogen sulfide (H S) with peroxynitrite (a key mediator in numerous pathological states) was studied in vitro and in different cellularmodels. The results show that H S can scavenge peroxynitrite with a corresponding second order rate constant of 3.3±0.4×10 M · s at 23°C (8± 2×10 M · s at 37°C). Activation parameters for the reaction (ΔH‡, ΔS‡ and ΔV‡) revealed that the mechanism is rather associative than multi-step free-radical as expected for other thiols. This is in agreement with a primary formation of a new reaction product characterized by spectral and computational studies as HSNO (thionitrate), predominantly present as sulfinyl nitrite, HS(O)NO. This is the first time a thionitrate has been shown to be generated under biologically relevant conditions. The potential of HS(O)NO to serve as a NO donor in a pH-dependent manner and its ability to release NO inside the cells has been demonstrated. Thus sulfide modulates the chemistry and biological effects of peroxynitrite by its scavenging and formation of a new chemical entity (HSNO ) with the potential to release NO, suppressing the pro-apoptotic, oxidative and nitrative properties of peroxynitrite. Physiological concentrations of H S abrogated peroxynitrite-induced cell damage as demonstrated by the: (i) inhibition of apoptosis and necrosis caused by peroxynitrite; (ii) prevention of protein nitration; and (iii) inhibition of PARP-1 [poly(ADP-ribose) polymerase 1] activation in cellular models, implying that a major part of the cytoprotective effects of hydrogen sulfide may be mediated by modulation of peroxynitrite chemistry, in particular under inflammatory conditions. © The Authors Journal compilation © 2012 Biochemical Society.},
author = {Filipovic, Milos and Miljkovic, Jan and Allgäuer, Andrea and Chaurio Gonzalez, Ricardo Alfredo and Shubina, Tatyana and Herrmann, Martin and Ivanovic-Burmazovic, Ivana},
doi = {10.1042/BJ20111389},
faupublication = {yes},
journal = {Biochemical Journal},
pages = {609-621},
peerreviewed = {Yes},
title = {{Biochemical} insight into physiological effects of {H} {2S}: {Reaction} with peroxynitrite and formation of a new nitric oxide donor, sulfinyl nitrite},
volume = {441},
year = {2012}
}
@article{faucris.119829864,
abstract = {Continuing a bio-mimetic approach, we have prepared peptide conjugates of a superoxide dismutase (SOD) mimic [MnL](+) (where HL=N-(2-hydroxybenzyl)-N,N'-bis[2-(N-methylimidazolyl)methyl]ethane-1,2-diamine), namely [MnL'-Arg(n-1)](n+) (where n=2, 4, 7 and 10) and [MnL'-Gly1](+). [MnL'-Arg(n-1)](n+) contained cationic residue(s) that emulate the electrostatic channel of the enzyme. Physicochemical methods showed that functionalization at the secondary amine of HL did not impair coordination to Mn(II) with association constants (Kassoc) between 1.6 and 3.3×10(6)M(-1). The Mn(III)/Mn(II) redox potential of the conjugates was between 0.27 and 0.30V vs SCE, slightly higher than [MnL](+) under the same conditions, but remain at a value that facilitates O2(-) dismutation. The catalytic rate constant (kcat) of the dismutation for the series was studied using a direct stopped-flow method, which showed that for compounds with the same overall charge, the alkylation of the secondary amine of [MnL](+) (kcat=5.0±0.1×10(6)M(-1)s(-1)) led to a lower value (i.e. for [MnL'Gly](+), kcat=4.2±0.1×10(6)M(-1)s(-1)). However, under the same conditions, kcat values between 5.0±0.4×10(6)M(-1)s(-1) and 6.6±0.1×10(6)M(-1)s(-1) were determined for [MnL'-Arg(n-1)](n+) conjugates, indicating that the cationic residue(s) compensated for the loss in activity. Analysis of the effect of ionic strength on the kcat strongly suggested that not all the charges were involved, but only the closest ones electrostatically influenced the SOD active metal centre.},
author = {Ching, H.Y. Vincent and Kenkel, Isabell and Delsuc, Nicolas and Mathieu, Emilie and Ivanovic-Burmazovic, Ivana and Policar, Clotilde},
doi = {10.1016/j.jinorgbio.2016.01.025},
faupublication = {yes},
journal = {Journal of Inorganic Biochemistry},
pages = {172-9},
peerreviewed = {unknown},
title = {{Bioinspired} superoxide-dismutase mimics: {The} effects of functionalization with cationic polyarginine peptides.},
volume = {160},
year = {2016}
}
@article{faucris.111041964,
abstract = {Ruthenium allenylidene complexes with carbon-rich polyaromatic moieties have been synthesized by using [RuCl(η-CH)(PPh)] (η-CH = cyclopentadienyl) as a precursor and the propargyl alcohols 10-ethynyl-10-hydroxyanthracen-9-one (ACO), 13-ethynyl-13-hydroxypentacen-6-one (PCO), 1-phenyl-1-(pyren-1-yl)prop-2-yn-1-ol (PyrPh), 9-ethynyl-9H-fluoren-9-ol (FN) and 6-ethynyl-6H-benzo[cd]pyren-6-ol (BPyr) as ligands. The resulting cationic allenylidene complexes, [Ru(η-CH)(CC(AO))(PPh)]PF (1), [Ru(η-CH)(CC(PCO))(PPh)]PF (2), [Ru(η-CH)(CC(PyrPh))(PPh)]PF (3), [Ru(η-CH)(CC(FN))(PPh)]PF (4), and [Ru(η-CH)(CC(BPyr))(PPh)]PF (5) show interesting intermolecular π-interactions in the solid-state structure as well as solution state complexation with pyrene (documented by Job's plots experiments). CV data indicate possible Ru(ii)/Ru(iii) oxidation, as well as the potential reduction of the carbon-rich allenylidene moiety.},
author = {Spörler, Susanne and Strinitz, Frank and Rodehutskors, Philipp Maximilian and Müller, Lisa and Waterloo, Andreas and Dürr, Maximilian and Hübner, Eike and Ivanovic-Burmazovic, Ivana and Tykwinski, Rik and Burzlaff, Nicolai},
doi = {10.1039/c5nj03556b},
faupublication = {yes},
journal = {New Journal of Chemistry},
pages = {6127-6134},
peerreviewed = {unknown},
title = {{Carbon}-rich cyclopentadienyl ruthenium allenylidene complexes},
volume = {40},
year = {2016}
}
@book{faucris.120214644,
abstract = {The present article summarizes some new aspects of the mechanism of the superoxide dismutation (disproportionation) catalyzed by seven-coordinate manganese and iron complexes with pentadentate ligands and ligand structural requirements for the high SOD activity of this class of complexes. We also shed light on stoichiometric reactions between iron porphyrins and superoxide, and on a nature of obtained metal-superoxide adducts (M-superoxo and/or M-peroxo). Characterization of such species is of a general chemical as well as biological importance, since they are invoked as key intermediates in the superoxide dismutase (SOD) and superoxide reductase (SOR) catalytic mechanisms, and also in the mechanisms of metalloenzyme-catalyzed dioxygen and hydrogen peroxide activation. © 2008 Elsevier Inc. All rights reserved.},
author = {Ivanovic-Burmazovic, Ivana},
doi = {10.1016/S0898-8838(08)00003-2},
faupublication = {yes},
keywords = {iron(II)-superoxo; iron(III)-peroxo; seven-coordinate complexes; SOD mimetics; superoxide},
note = {UnivIS-Import:2015-03-09:Pub.2008.nat.dchph.lbioch.cataly},
pages = {59-100},
peerreviewed = {Yes},
publisher = {Academic Press, Inc.},
title = {{Catalytic} dismutation vs. reversible binding of superoxide},
volume = {60},
year = {2008}
}
@article{faucris.245135024,
abstract = {In nature, C-H bond oxidation of CH4 involves a peroxo intermediate that decays to the high-valent active species of either a "closed" {FeIV(μ-O)2FeIV} core or an "open" {FeIV(O)(μ-O)FeIV(O)} core. To mimic and to obtain more mechanistic insight in this reaction mode, we have investigated the reactivity of the bioinspired diiron complex [(susan){Fe(OH)(μ-O)Fe(OH)}]2+ [susan = 4,7-dimethyl-1,1,10,10-tetrakis(2-pyridylmethyl)-1,4,7,10-tetraazadecane], which catalyzes CH3OH oxidation with H2O2 to HCHO and HCO2H. The kinetics is faster in the presence of a proton. 18O-labeling experiments show that the active species, generated by a decay of the initially formed peroxo intermediate [(susan){FeIII(μ-O)(μ-O2)FeIII}]2+, contains one reactive oxygen atom from the μ-oxo and another from the μ-peroxo bridge of its peroxo precursor. Considering an FeIVFeIV active species, a "closed" {FeIV(μ-O)2FeIV} core explains the observed labeling results, while a scrambling of the terminal and bridging oxo ligands is required to account for an "open" {FeIV(O)(μ-O)FeIV(O)} core.},
author = {Zimmermann, Thomas Philipp and Orth, Nicole and Finke, Sebastian and Limpke, Thomas and Stammler, Anja and Bögge, Hartmut and Walleck, Stephan and Ivanovic-Burmazovic, Ivana and Glaser, Thorsten},
doi = {10.1021/acs.inorgchem.0c02698},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {CRIS-Team Scopus Importer:2020-11-13},
pages = {15563-15569},
peerreviewed = {Yes},
title = {{Catalytic} {H2O2} {Activation} by a {Diiron} {Complex} for {Methanol} {Oxidation}},
volume = {59},
year = {2020}
}
@article{faucris.258197170,
abstract = {One of the challenges of catalysis is the transformation of inert C-H bonds to useful products. Copper-containing monooxygenases play an important role in this regard. Here we show that low-temperature oxygenation of dinuclear copper(I) complexes leads to unusual tetranuclear, mixed-valent mu(4)-peroxo [Cu-I/Cu-II](2) complexes. These Cu4O2 intermediates promote irreversible and thermally activated O-O bond homolysis, generating Cu2O complexes that catalyze strongly exergonic H-atom abstraction from hydrocarbons, coupled to O-transfer. The Cu2O species can also be produced with N2O, demonstrating their capability for small-molecule activation. The binding and cleavage of O-2 leading to the primary Cu4O2 intermediate and the Cu2O complexes, respectively, is elucidated with a range of solution spectroscopic methods and mass spectrometry. The unique reactivities of these species establish an unprecedented, 100 % atom-economic scenario for the catalytic, copper-mediated monooxygenation of organic substrates, employing both O-atoms of O-2.},
author = {Jurgeleit, Ramona and Grimm-Lebsanft, Benjamin and Floeser, Benedikt Maria and Teubner, Melissa and Buchenau, Soren and Senft, Laura and Hoffmann, Jonas and Naumova, Maria and Naether, Christian and Ivanovic-Burmazovic, Ivana and Ruebhausen, Michael and Tuczek, Felix},
doi = {10.1002/anie.202101035},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
note = {CRIS-Team WoS Importer:2021-05-14},
peerreviewed = {Yes},
title = {{Catalytic} {Oxygenation} of {Hydrocarbons} by {Mono}-mu-oxo {Dicopper}({II}) {Species} {Resulting} from {O}-{O} {Cleavage} of {Tetranuclear} {Cu}-{I}/{Cu}-{II} {Peroxo} {Complexes}},
year = {2021}
}
@article{faucris.111855524,
abstract = {A new catalyst (see structure) hydroxylates phenols with O via a stable side-on peroxide complex, which is similar to the active site of tyrosinase in terms of the ligand environment and its spectroscopic properties. The catalytic oxidation of phenols to quinones proceeds at room temperature in the presence of NEt and even non-native substrates can be oxidized catalytically. The reaction mechanism is analogous to that of the enzyme-catalyzed reaction. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Hoffmann, Alexander and Citek, Cooper and Binder, Stephan and Goos, Arne and Rübhausen, Michael and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Wasinger, Erik W. and Stack, T. Daniel P. and Herres-Pawlis, Sonja},
doi = {10.1002/anie.201301249},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {5398-5401},
peerreviewed = {Yes},
title = {{Catalytic} phenol hydroxylation with dioxygen: {Extension} of the tyrosinase mechanism beyond the protein matrix},
volume = {52},
year = {2013}
}
@article{faucris.201111245,
author = {Weekley, Claire M. and Kenkel, Isabell and Lippert, Rainer and Wei, Shengwei and Lieb, Dominik and Cranwell, Tiffanny and Wedding, Jason L. and Zillmann, Annika and Rohr, Robin and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and Harris, Hugh H.},
doi = {10.1021/acs.inorgchem.6b03073},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {6076-6093},
peerreviewed = {Yes},
title = {{Cellular} {Fates} of {Manganese}({II}) {Pentaazamacrocyclic} {Superoxide} {Dismutase} ({SOD}) {Mimetics}: {Fluorescently} {Labeled} {MnSOD} {Mimetics}, {X}-ray {Absorption} {Spectroscopy}, and {X}-ray {Fluorescence} {Microscopy} {Studies}},
volume = {56},
year = {2017}
}
@article{faucris.117879124,
abstract = {To fully characterize the CoIII-'nitrene radical' species that are proposed as intermediates in nitrene transfer reactions mediated by cobalt(II) porphyrins, different combinations of cobalt(II) complexes of porphyrins and nitrene transfer reagents were combined, and the generated species were studied using EPR, UV-vis, IR, VCD, UHR-ESI-MS, and XANES/XAFS measurements. Reactions of cobalt(II) porphyrins 1P1 (P1 = meso-tetraphenylporphyrin (TPP)) and 1P2 (P2 = 3,5-DitBu-ChenPhyrin) with organic azides 2Ns (NsN3), 2Ts (TsN3), and 2Troc (TrocN3) led to the formation of mono-nitrene species 3P1Ns, 3P2Ts, and 3P2Troc, respectively, which are best described as [CoIII(por)(NR″•-)] nitrene radicals (imidyl radicals) resulting from single electron transfer from the cobalt(II) porphyrin to the 'nitrene' moiety (Ns: R″ = -SO2-p-C6H5NO2; Ts: R″ = -SO2C6H6; Troc: R″ = -C(O)OCH2CCl3). Remarkably, the reaction of 1P1 with N-nosyl iminoiodane (PhI=NNs) 4Ns led to the formation of a bis-nitrene species 5P1Ns. This species is best described as a triple-radical complex [(por•-)CoIII(NR″•-)2] containing three ligand-centered unpaired electrons: two nitrene radicals (NR″•-) and one oxidized porphyrin radical (por•-). Thus, the formation of the second nitrene radical involves another intramolecular one-electron transfer to the "nitrene" moiety, but now from the porphyrin ring instead of the metal center. Interestingly, this bis-nitrene species is observed only on reacting 4Ns with 1P1. Reaction of the more bulky 1P2 with 4Ns results again in formation of mainly mono-nitrene species 3P2Ns according to EPR and ESI-MS spectroscopic studies. The mono- and bis-nitrene species were initially expected to be five- and six-coordinate species, respectively, but XANES data revealed that both mono- and bis-nitrene species are six-coordinate Oh species. The nature of the sixth ligand bound to cobalt(III) in the mono-nitrene case remains elusive, but some plausible candidates are NH3, NH2-, NsNH-, and OH-; NsNH- being the most plausible. Conversion of mono-nitrene species 3P1Ns into bis-nitrene species 5P1Ns upon reaction with 4Ns was demonstrated. Solutions containing 3P1Ns and 5P1Ns proved to be still active in catalytic aziridination of styrene, consistent with their proposed key involvement in nitrene transfer reactions mediated by cobalt(II) porphyrins.},
author = {Goswami, Monalisa and Lyaskovskyy, Volodymyr and Domingos, Sergio R. and Buma, Wybren Jan and Woutersen, Sander and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Lu, Hongjian and Cui, Xin and Zhang, X. Peter and Reijerse, Edward J. and DeBeer, Serena and van Schooneveld, Matti M. and Pfaff, Florian Felix and Ray, Kallol and de Bruin, Bas},
doi = {10.1021/jacs.5b01197},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {5468-5479},
peerreviewed = {Yes},
title = {{Characterization} of porphyrin-{Co}({III})-'nitrene radical' species relevant in catalytic nitrene transfer reactions},
volume = {137},
year = {2015}
}
@article{faucris.120214864,
abstract = {We have synthesized and characterized two Mn(II) seven-coordinate complexes with N5 pentadentate ligands, which contain hydrazone and hydrazide groups respectively. We have shown that insertion of hydrazido (amido) groups into the ligand sphere increases the negative charge of the chelate, without changing a donor atom set and coordination geometry, and radically modulate a redox activity of seven-coordinate manganese complexes, which is important for the function of manganese as a superoxide dismutase catalytic center. © 2009 The Royal Society of Chemistry.},
author = {Liu, Gaofeng and Dürr, Katharina L. and Puchta, Ralph and Heinemann, Frank Wilhelm and van Eldik, Rudi and Ivanovic-Burmazovic, Ivana},
doi = {10.1039/b906100m},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {6292-6295},
peerreviewed = {Yes},
title = {{Chelate} electronic properties control the redox behaviour and superoxide reactivity of seven-coordinate manganese({II}) complexes},
volume = {null},
year = {2009}
}
@article{faucris.111859044,
abstract = {Anionic metal oxide clusters, so-called polyoxometalates, can be developed as molecular model compounds to mimic the chemical and photochemical reactivity of solid-state metal oxides on the molecular level. Inspired by the well-known visible-light photocatalyst BiVO , the first molecular bismuth vanadium oxide has been synthesized to investigate the chemical and photochemical similarities between the solid-state and molecular compounds. The cluster H [(Bi(dmso) ) V O ]aca. 4a DMSO was obtained from simple precursors in almost quantitative yield. Structural analysis showed that the cluster shell is based on the unusual all-vanadium μ-Keggin framework [μ-V O ] , which is stabilized by coordination of four Bi centers. The acidic character of the three cluster protons was demonstrated by titration studies. The cluster shows promising photocatalytic properties in visible-light photooxidation reactions and has high activity (turnover number >1200), high quantum yield (∥=7.6a %), and good recyclability, which make it a promising first example of a new class of heterometallic polyoxometalates. An all-vanadium μ-Keggin anion [μ-(VO )V O ] is surrounded by a tetrahedral arrangement of four Bi centers in polyoxometalate 1 , which is the first structurally characterized bismuth vanadium oxide cluster (central V blue, V green, Bi orange). The cluster is acidic and photoactive under visible-light irradiation, and shows high turnover numbers and good quantum yields in the photooxidation of model pollutant patent blue V (PBV). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Tucher, Johannes and Nye, Leanne and Ivanovic-Burmazovic, Ivana and Notarnicola, Antonio and Streb, Carsten},
doi = {10.1002/chem.201200404},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {10949-10953},
peerreviewed = {Yes},
title = {{Chemical} and photochemical functionality of the first molecular bismuth vanadium oxide},
volume = {18},
year = {2012}
}
@article{faucris.121243144,
abstract = {Dihydrogen sulfide recently emerged as a biological signaling molecule with important physiological roles and significant pharmacological potential. Chemically plausible explanations for its mechanisms of action have remained elusive, however. Here, we report that HS reacts with S-nitrosothiols to form thionitrous acid (HSNO), the smallest S-nitrosothiol. These results demonstrate that, at the cellular level, HSNO can be metabolized to afford NO, NO, and NO species, all of which have distinct physiological consequences of their own. We further show that HSNO can freely diffuse through membranes, facilitating transnitrosation of proteins such as hemoglobin. The data presented in this study explain some of the physiological effects ascribed to HS, but, more broadly, introduce a new signaling molecule, HSNO, and suggest that it may play a key role in cellular redox regulation. © 2012 American Chemical Society.},
author = {Filipovic, Milos and Miljkovic, Jan and Nauser, Thomas and Royzen, Maksim and Klos, Katharina and Shubina, Tatyana and Koppenol, Willem H. and Lippard, Stephen J. and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ja3009693},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {12016-12027},
peerreviewed = {Yes},
title = {{Chemical} characterization of the smallest {S}-nitrosothiol, {HSNO}; {Cellular} cross-talk of {H2S} and {S}-nitrosothiols},
volume = {134},
year = {2012}
}
@article{faucris.242411441,
abstract = {We have synthesized and characterized Co(II) (1), Zn(II) (2), Fe(III) (3) and Cu(II) (4) complexes of 2,2'-[2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)]bis[N,N,N-trimethyl-2-oxoethanaminium] dichloride (H2LCl2) by NMR, IR, and X-Band EPR spectroscopy, respectively, as well as by single-crystal X-ray structural analysis. H2LCl2 belongs to the class of diacetylpyridine bis(hydrazone) ligands and bears two positively charged quaternary ammonium functionalities. The complexes 1–3 possess a pentagonal-bipyramidal geometry, whereas 4 has square-pyramidal geometry. Redox reactivity and SOD activity of the complexes was studied by means of electrochemical measurements in aqueous-buffer and DMF or DMSO solutions, respectively, as well as by stopped-flow measurements. Complexes 1–3 do not have SOD activity, whereas 4 exhibits a high catalytic rate constant for the superoxide dismutation, kcat = 1.73 × 107 m–1 s–1 (in MOPS buffer solution of pH = 7.4). The results were discussed in terms of complex redox potentials, electrostatic interactions and their spatial distribution, kinetic lability of metal centers, and stability of peroxo intermediates, respectively.},
author = {Stojičkov, Marko and Sturm, Sabrina and Čobeljić, Božidar and Pevec, Andrej and Jevtović, Mima and Scheitler, Andreas and Radanović, Dušanka and Senft, Laura and Turel, Iztok and Andjelković, Katarina and Miehlich, Matthias and Meyer, Karsten and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/ejic.202000415},
faupublication = {yes},
journal = {European Journal of Inorganic Chemistry},
keywords = {Cobalt; Copper; Electrochemistry; Iron; SOD activity; Structure elucidation},
note = {CRIS-Team Scopus Importer:2020-09-11},
peerreviewed = {Yes},
title = {{Cobalt}({II}), {Zinc}({II}), {Iron}({III}), and {Copper}({II}) {Complexes} {Bearing} {Positively} {Charged} {Quaternary} {Ammonium} {Functionalities}: {Synthesis}, {Characterization}, {Electrochemical} {Behavior}, and {SOD} {Activity}},
year = {2020}
}
@article{faucris.111980704,
author = {Parmene, J. and Ivanovic-Burmazovic, Ivana and Tilset, M. and van Eldik, Rudi},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {UnivIS-Import:2015-03-09:Pub.2009.nat.dchph.lbioch.combin},
pages = {9092-9103},
peerreviewed = {Yes},
title = {{Combined} {Low} {Temperature} {Rapid} {Scan} and {1H} {NMR} {Mechanistic} {Study} of the {Protonation} and {Subsequent} {Benzene} {Elimination} from a ({Diimine})platinum({II}) {Diphenyl} {Complex} {Relevant} to {Arene} {C}-{H} {Activation} {Parmene}, {J}.; {Ivanovic}-{Burmazovic}, {I}.; {Tilset}, {M}.; van {Eldik}, {R}. {Inorg}. {Chem}., 2009, 48 (19), 9092-9103},
volume = {48},
year = {2009}
}
@article{faucris.120215084,
abstract = {Stopped-flow measurements have been successfully combined with time-resolved UV/vis spectroscopy and global spectral analysis of superoxide decay for the comparative study of catalytic activity of putative manganese SOD (superoxide dismutase) mimetics known in the literature. The SOD activity of the studied complexes decreases in the following order: a) M40403 > Mn(III)TM-4-PyP > Mn(II)pyane > > EUK-113 at pH 7.4 (M40403 = ([manganese(II)dichlorido{(4R,9R,14R,19R)-3,10,13,20,26- pentaazatetracyclo[20.3.1.0.4,9014,19]hexacosa-1(26),-22(23),24-triene}], Mn(III)TM-4-PyP = Mn(III)meso-tetrakis(N-methylpyridinium-4-yl) porphyrin, Mn(II)Pyane = Mn(II)trans-2,13-dimethyl-3,6,9,12,18- pentaazabicyclo[12.3.1]-octadeca-1(18),14,16-triene, EUK-113 = [manganese(III)acetato(6,6′-((1E,1′E)-(ethane-1,2- diylbis(azanylylidene))bis(methanylylidene))bis(2-methoxyphenolate)]) in Hepes buffer (Hepes = 4-(2-Hydroxyethyl)piperazine-1-ethanesulfonic acid), b) Mn(III)TM-4-PyP > M40403 ≅ Mn(II)pyane ≫ EUK-113 at pH 8.1 in Hepes buffer and c) Mn(III)TM-4-PyP ≅ Mn(II)pyane > MnCl > M40403 ≅ EUK-113 at pH 7.4 in phosphate buffer. MnCl in Hepes, Mn(III)TSPP , Mn(III)TBAP , Mn(III)acetate, Mn(II)lactate and Mn(II)EDTA do not exhibit SOD activity (Mn(III)TSPP = Mn(III)mesotetrakis(benzoic acid)porphyrin, Mn(III)TBAP = Mn(III)mesotetrakis(4-sulfonatophenyl)porphyrin). MnCl possess SOD activity that is comparable with those of other mimetics in the presence of phosphate. Our results demonstrate that phosphate anions, independent of ionic strength effect, influence the activity of manganese SOD mimetics, which is crucial for understanding and comparing their biological activity. © 2011 Elsevier Inc. All rights reserved.},
author = {Friedel, Felix and Lieb, Dominik and Ivanovic-Burmazovic, Ivana},
doi = {10.1016/j.jinorgbio.2011.12.008},
faupublication = {yes},
journal = {Journal of Inorganic Biochemistry},
pages = {26-32},
peerreviewed = {Yes},
title = {{Comparative} studies on manganese-based {SOD} mimetics, including the phosphate effect, by using global spectral analysis},
volume = {109},
year = {2012}
}
@article{faucris.120215304,
abstract = {In a template synthesis from ethanolic solution of MoOCl, 2,6-diacetylpyridine (dap), and semioxamazide (sox), in the molar ratio 1:1:2, a dimeric molybdenum(V) complex [MoO(Hdapsox)]Cl · 4HO (where Hdapsox = 2′,2‴-(2,6-pyridinediyldiethylidenedioxa- mohydrazide) was obtained. In a similar reaction, starting from La(NO) · 6HO, the complex [La(Hdapsox)(NO) ](NO) · 1/2EtOH (x = 1,2), having coordination number 9, was obtained. In the latter complex two NO groups were bidentately coordinated in the solid state, but only one in the solution. Besides [MoO(TPP)] (TPP = tetraphenylporphyrin), the molybdenum(V) complex [MoO (Hdapsox)]Cl · 4HO is the only other known example of a dimeric μ-oxodimolybdenum(V) species that is paramagnetic (μ = 0.95 BM). One of the Mo atoms has pentagonal bipyramidal coordination, and the other pentagonal pyramidal coordination. In aqueous solution a rare example of a pentagonal pyramidal ion [MoO(dapsox)] is presumably present. Solution EPR spectra (at 77 K) cannot be related to either of the two known types of Mo(V) species based on the extent of g anisotropy. The substances also were characterized by IR and electronic spectroscopy, and by thermal analysis.},
author = {Andjelkovic, K. and Ivanovic-Burmazovic, Ivana and Gruden, M. and Niketic, S. R.},
faupublication = {no},
journal = {Journal of Coordination Chemistry},
pages = {289-300},
peerreviewed = {Yes},
title = {{Complexes} of molybdenum({V}) and lanthanum({III}) with 2′,2â´-(2,6-pyridinediyldiethylidene)-dioxamohydrazide ({H2dapsox})},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0035552934&origin=inward},
volume = {53},
year = {2001}
}
@article{faucris.119831844,
abstract = {Copper chloride catalysis is a well-established field in organic and inorganic chemistry. However, in most cases a detailed mechanistic understanding of the individual reaction steps and identification of reactive intermediates are still missing. The present study reports the results of spectroscopic and spectrometric measurements that support formation of copper agglomerates during catalytic processes. The composition of CuCl2·2H2O in several coordinating solvents and the influence of basic coreagents such as NaO(t)Bu and K2CO3 on the structure in the solid state as well as in solution were investigated. Several experiments involving crystal structure determination, IR spectroscopy, and ultra-high-resolution cryospray-ionization mass spectrometry were performed. The crystal structures of [CuCl2(H2O)]·0.5(CH3)2CO (1), [Cu2(CH3CN)2Cl4] (2), [Cu3(CH3CN)3Cl6] (3), [Cu3Cl6(THF)4] (4), [Cu(DMSO)2Cl2] (5), (H2N(CH3)2)2[CuCl3] (6), and [Cu4OCl6(THF)(urea)3]·3THF·urea (8) are reported herein. It can be clearly demonstrated that μ4-oxido copper clusters of the formula [Cu4OCl6(solvent)4] are the main product from the reactions of CuCl2·2H2O and basic coreagents. As a final result of these experiments, it can be stated that μ4-oxido copper clusters most likely play an important role in the mechanism of copper chloride-catalyzed reactions.},
author = {Becker, Sabine and Dürr, Maximilian and Msika, Andreas and Becker, Jonathan and Gawlig, Christopher and Behrens, Ulrich and Ivanovic-Burmazovic, Ivana and Schindler, Siegfried},
doi = {10.1021/acs.inorgchem.5b02576},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {3759-66},
peerreviewed = {No},
title = {{Copper} {Chloride} {Catalysis}: {Do} μ4-{Oxido} {Copper} {Clusters} {Play} a {Significant} {Role}?},
volume = {55},
year = {2016}
}
@article{faucris.121243364,
abstract = {Starting from Cu(II) and Ni(II) perchlorate and Fe(III) chloride in the presence of 26-diacetylpyridine (dap) and semioxamazide (sox)the [Cu(Hdapsox)HO]ClO (I)[Ni(Hdapsox)(MeOH)]ClO (II) and [Fe(Hdapsox)Cl] - HO (III) complexes with a singly deprotonated ligand Hdapsox of the acyl hydrazone class (with H dapsox=2′2‴-(26-pyridindiyldiethylidene) dioxamohydrazide) have been obtained and characterized for the first time by a template synthesis The previously assumed square-pyramidal structure of the Cu(II) complex with an asymmetrical coordination of Hdapsox has been confirmed by a single-crystal X-ray analysis In II Hdapsox is octahedrally coordinated around a Ni(II) ionwhile III is found to be a pentagonal-bipyramidal complex with a symmetrically bonded Hdapsox Causes of a ligand deprotonation occurring in a very acid medium (pH=0) and of a different coordination pattern in the case of Cu(II)Ni(II) and Fe(III) are interpreted by a d configuration and an effective nuclear charge of the central metal ion (crystal field effects) © 1998 Elsevier Science Ltd All rights reserved.},
author = {Ivanovic-Burmazovic, Ivana and Bacchi, Alessia and Pelizzi, Giancarlo and Leovac, V. and Andjelkovic, K.},
faupublication = {yes},
journal = {Polyhedron},
pages = {119-127},
peerreviewed = {Yes},
title = {{Cu}({II}), {Ni}({II}) and {Fe}({III}) {Complexes} with 2’2’’’-(2,6-{Pyridindiyldiethylidene})-dioxamohydrazide in a {Monoanionic} {Form}. {The} {Crystal} {Structure} of {Aqua}-2’,2’’’-(2,6–piridindiyldiethylidene)–dioxamohydrazidecopper ({II}) {Perchlorate}},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0000948921&origin=inward},
volume = {18},
year = {1998}
}
@article{faucris.201114322,
abstract = {tBuPhINTs and copper(I) acetonitrile complexes. Their stoichiometric reactivity has been elucidated regarding the imination of phosphines and the aziridination of styrenes. The formation and thermal decay of the copper nitrenes were investigated by UV/Vis spectroscopy of the highly coloured species. Additionally, the compounds were studied by cryo-UHR-ESI mass spectrometry and DFT calculations. In addition, a mild catalytic procedure has been developed where the copper nitrene precursors enable the C-H amination of cyclohexane and toluene and the aziridination of styrenes.},
author = {Moegling, Julian and Hoffmann, Alexander and Thomas, Fabian and Orth, Nicole and Liebhaeuser, Patricia and Herber, Ulrich and Rampmaier, Robert and Stanek, Julia and Fink, Gerhard and Ivanovic-Burmazovic, Ivana and Herres-Pawlis, Sonja},
doi = {10.1002/anie.201713171},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
peerreviewed = {Yes},
title = {{Designed} {To} {React}: {Terminal} {Copper} {Nitrenes} and {Their} {Application} in {Catalytic} {C}-{H} {Aminations}.},
year = {2018}
}
@article{faucris.111862124,
abstract = {Physical data concerning the absorption kinetics like the diffusion coefficients are important values for designing an economically working gas separation processes. Considering ionic liquids, which emerged in recent years as interesting alternative solvent media for versatile industrial purposes, usually only solubility data for gases are available if at all. Therefore in order to gain additional information such as diffusion coefficients of gases in ionic liquids, we established an efficient and easily assembled set-up based on time-resolved FTIR measurements. Applying this methodology, the diffusion coefficient of carbon dioxide in 1-ethyl-3-methyl-imidizolium bis[(trifluoromethyl)sulfonyl]amide (EMIM NTf ) was determined at a temperature of 303 K. © 2011 Elsevier Ltd. All rights reserved.},
author = {Kortenbruck, Kerstin and Pohrer, Benjamin and Schlücker, Eberhard and Friedel, Felix and Ivanovic-Burmazovic, Ivana},
doi = {10.1016/j.jct.2011.09.025},
faupublication = {yes},
journal = {Journal of Chemical Thermodynamics},
pages = {76-80},
peerreviewed = {Yes},
title = {{Determination} of the diffusion coefficient of {CO} 2 in the ionic liquid {EMIM} {NTf} 2 using online {FTIR} measurements},
volume = {47},
year = {2012}
}
@article{faucris.121230384,
abstract = {Two dinuclear seven-coordinate manganese(II) complexes containing two pentaazamacrocyclic subunits, with imine or amine functionalities, respectively, have been synthesized and characterized in the solid state as well as in aqueous solutions of different pH, by performing X-ray structure analyses, SQUID, potentiometric, electron spray ionization-mass spectrometry (ESI-MS), electrochemical, and (17)O NMR water exchange measurements (varying temperature and pressure), and by determination of SOD activity. The two manganese(II) centers within the dinuclear structures behave independently from each other and similarly to the manganese centers in the corresponding mononuclear complexes. However, the dinuclear amine complex possesses increased complex stability and acidity of the coordinated water molecules (pK(a2) = 8.92) in comparison to the corresponding mononuclear analogue. This allowed us to observe a stable trans-aqua-hydroxo-Mn(II) species in an aqueous solution and to study for the first time the trans-effect of the hydroxo group on the water lability on any divalent metal center in general. The observed trans-labilizing effect of the hydroxo ligand is much smaller than in the case of aqua-hydroxo-M(III) trivalent metal species. Whether this is a general property of trans-aqua-hydroxo-M(II) species, or if it is specific for Mn(II) and/or to the seven-coordinate structures, remains to be seen and motivates future studies. In addition, an influence of the hydroxo ligand on the SOD activity of manganese(II) complexes could be evaluated for the first time as well. Compared with the mononuclear analogue, which is not able to form stable hydroxo species, our pH dependent studies on the SOD activity of the dinuclear amine complex have indicated that the hydroxo ligand may promote protonation and release of the product H(2)O(2), especially in solutions of higher pH values, by increasing its pK(a) value.},
author = {Lieb, Dominik and Friedel, Felix and Yawer, Mirza and Zahl, Achim and Khusniyarov, Marat and Heinemann, Frank Wilhelm and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic301714d},
faupublication = {yes},
journal = {Inorganic Chemistry},
month = {Jan},
pages = {222-236},
peerreviewed = {Yes},
title = {{Dinuclear} seven-coordinate {Mn}({II}) complexes: {Effect} of manganese({II})- hydroxo species on water exchange and superoxide dismutase activity},
volume = {52},
year = {2013}
}
@article{faucris.117879344,
abstract = {The synthesis of a pentadentate ligand with strategically designed fluorinated arene groups in the second coordination sphere of a nonheme iron center is reported. The oxidatively resistant fluorine substituents allow for the trapping and characterization of an Fe(O) complex at ?20 °C. Upon warming of the Fe(O) complex an unprecedented arene C-F hydroxylation reaction occurs. Computational studies support the finding that substrate orientation is a critical factor in the observed reactivity. This work not only gives rare direct evidence for the participation of an Fe(O) species in arene hydroxylation but also provides the first example of a high-valent iron-oxo complex that mediates aromatic C-F hydroxylation.},
author = {Sahu, Sumit and Quesne, Matthew G. and Davies, Casey G. and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Siegler, Maxime A. and Jameson, Guy N.L. and de Visser, Sam P. and Goldberg, David P.},
doi = {10.1021/ja507346t},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {13542-13545},
peerreviewed = {Yes},
title = {{Direct} observation of a nonheme iron({IV})-oxo complex that mediates aromatic c-f hydroxylation},
volume = {136},
year = {2014}
}
@article{faucris.218412226,
abstract = {H
2
S is a gaseous signaling molecule that modifies cysteine residues in proteins to form persulfides (P-SSH). One family of proteins modified by H
2
S are zinc finger (ZF) proteins, which contain multiple zinc-coordinating cysteine residues. Herein, we report the reactivity of H
2
S with a ZF protein called tristetraprolin (TTP). Rapid persulfidation leading to complete thiol oxidation of TTP mediated by H
2
S was observed by low-temperature ESI-MS and fluorescence spectroscopy. Persulfidation of TTP required O
2
, which reacts with H
2
S to form superoxide, as detected by ESI-MS, a hydroethidine fluorescence assay, and EPR spin trapping. H
2
S was observed to inhibit TTP function (binding to TNFα mRNA) by an in vitro fluorescence anisotropy assay and to modulate TNFα in vivo. H
2
S was unreactive towards TTP when the protein was bound to RNA, thus suggesting a protective effect of RNA.},
author = {Lange, Mike and Ok, Kiwon and Shimberg, Geoffrey D. and Bursac, Biljana and Markó, Lajos and Ivanovic-Burmazovic, Ivana and Michel, Sarah L.J. and Filipovic, Milos},
doi = {10.1002/anie.201900823},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {hydrogen sulfide; mass spectrometry; persulfidation; superoxide; zinc finger proteins},
note = {CRIS-Team Scopus Importer:2019-05-24},
peerreviewed = {Yes},
title = {{Direct} {Zinc} {Finger} {Protein} {Persulfidation} by {H2S} {Is} {Facilitated} by {Zn2}+},
year = {2019}
}
@article{faucris.117872744,
abstract = {In this work we report a design, synthesis, and detailed functional characterization of unique strongly biased allosteric agonists of CXCR3 that contain tetrahydroisoquinoline carboxamide cores. Compound 11 (FAUC1036) is the first strongly biased allosteric agonist of CXCR3 that selectively induces weak chemotaxis and leads to receptor internalization and the β-arrestin 2 recruitment with potency comparable to that of the chemokine CXCL11 without any activation of G proteins. A subtle structural change (addition of a methoxy group, 14 (FAUC1104)) led to a contrasting biased allosteric partial agonist that activated solely G proteins, induced chemotaxis, but failed to induce receptor internalization or β-arrestin 2 recruitment. Concomitant structure-activity relationship studies indicated very steep structure-activity relationships, which steer the ligand bias between the β-arrestin 2 and G protein pathway. Overall, the information presented provides a powerful platform for further development and rational design of strongly biased allosteric agonists of CXCR3.},
author = {Lampros, Milanos and Brox, Regine and Frank, Theresa and Poklukar, Gasper and Palmisano, Ralf and Waibel, Reiner and Einsiedel, Jürgen and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Larsen, Olav and Hjorto, Gertrud Malene and Rosenkilde, Mette Marie and Tschammer, Nuska},
doi = {10.1021/acs.jmedchem.5b01965},
faupublication = {yes},
journal = {Journal of Medicinal Chemistry},
pages = {2222-43},
peerreviewed = {unknown},
title = {{Discovery} and {Characterization} of {Biased} {Allosteric} {Agonists} of the {Chemokine} {Receptor} {CXCR3}.},
volume = {59},
year = {2016}
}
@inproceedings{faucris.120443224,
abstract = {This paper presents methods that are used in AMRES (Academic Network of Serbia) network in order to equally distribute a large amount of web traffic toward the centralized cloud firewall system. Although some of the methods can be only used with the Cisco equipment, other methods can be used with equipment of any manufacturer or open-source solutions that are relaying on proxy functionality in order to forward the web traffic. The Idea for the paper was born during the work on the Géant3 plus project on the NA3T2 (Network Activity 3/Task 2) task. © 2013 IEEE.},
author = {Ivanovic-Burmazovic, Ivana},
booktitle = {12th RoEduNet International Conference: Networking in Education and Research, RoEduNet 2013},
doi = {10.1109/RoEduNet.2013.6714185},
title = {{Distribution} of web traffic toward the centralized cloud firewall system},
venue = {Costanta},
year = {2013}
}
@article{faucris.120801604,
abstract = {Hydrogen sulfide (H2S) and nitric oxide (NO) are important signaling molecules that regulate several physiological functions. Understanding the chemistry behind their interplay is important for explaining these functions. The reaction of H2S with S-nitrosothiols to form the smallest S-nitrosothiol, thionitrous acid (HSNO), is one example of physiologically relevant cross-talk between H2S and nitrogen species. Perthionitrite (SSNO(-)) has recently been considered as an important biological source of NO that is far more stable and longer living than HSNO. In order to experimentally address this issue here, we prepared SSNO(-) by two different approaches, which lead to two distinct species: SSNO(-) and dithionitric acid [HON(S)S/HSN(O)S]. (H)S2NO species and their reactivity were studied by (15)N NMR, IR, electron paramagnetic resonance and high-resolution electrospray ionization time-of-flight mass spectrometry, as well as by X-ray structure analysis and cyclic voltammetry. The obtained results pointed toward the inherent instability of SSNO(-) in water solutions. SSNO(-) decomposed readily in the presence of light, water, or acid, with concomitant formation of elemental sulfur and HNO. Furthermore, SSNO(-) reacted with H2S to generate HSNO. Computational studies on (H)SSNO provided additional explanations for its instability. Thus, on the basis of our data, it seems to be less probable that SSNO(-) can serve as a signaling molecule and biological source of NO. SSNO(-) salts could, however, be used as fast generators of HNO in water solutions.},
author = {Wedmann, Rudolf and Zahl, Achim and Shubina, Tatyana and Dürr, Maximilian and Heinemann, Frank Wilhelm and Bugenhagen, Bernhard Eberhard Christian and Burger, Peter and Ivanovic-Burmazovic, Ivana and Filipovic, Milos},
doi = {10.1021/acs.inorgchem.5b00831},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {9367-80},
peerreviewed = {No},
title = {{Does} perthionitrite ({SSNO}(-)) account for sustained bioactivity of {NO}? {A} (bio)chemical characterization.},
volume = {54},
year = {2015}
}
@article{faucris.120403184,
abstract = {The new ligand N3PySR and its Fe complex [Fe(N3PySR)](BF) (1) are described. Reaction of 1 with PhIO at -40 C gives metastable [Fe (O)(N3PySR)] (2), containing a sulfide ligand and a single amide H-bond donor in proximity to the terminal oxo group. Direct evidence for H-bonding is seen in a structural analogue, [Fe (Cl)(N3PySR)](BF) (3). Complex 2 exhibits rapid O-atom transfer (OAT) toward external sulfide substrates, but no intramolecular OAT. However, direct S-oxygenation does occur in the reaction of 1 with mCPBA, yielding sulfoxide-ligated [Fe (N3PyS(O)R)](BF) (4). Catalytic OAT with 1 was also observed. © 2014 American Chemical Society.},
author = {Widger, Leland R. and Davies, Casey G. and Yang, Tzuhsiung and Siegler, Maxime A. and Tröppner, Oliver and Jameson, Guy N.L. and Ivanovic-Burmazovic, Ivana and Goldberg, David P.},
doi = {10.1021/ja410240c},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {2699-2702},
peerreviewed = {Yes},
title = {{Dramatically} accelerated selective oxygen-atom transfer by a nonheme iron({IV})-oxo complex: {Tuning} of the first and second coordination spheres},
volume = {136},
year = {2014}
}
@article{faucris.219414719,
abstract = {A Cu(i) fully fluorinated O-donor monodentate alkoxide complex, K[Cu(OC
4
F
9
)
2
], was previously shown to form a trinuclear copper-dioxygen species with a {Cu
3
(μ
3
-O)
2
} core, T
OC
4
F
9
, upon reactivity with O
2
at low temperature. Herein is reported a significantly expanded kinetic and mechanistic study of T
OC
4
F
9
formation using stopped-flow spectroscopy. The T
OC
4
F
9
complex performs catalytic oxidase conversion of hydroquinone (H
2
Q) to benzoquinone (Q). T
OC
4
F
9
also demonstrated hydroxylation of 2,4-di-tert-butylphenolate (DBP) to catecholate, making T
OC
4
F
9
the first trinuclear species to perform tyrosinase (both monooxygenase and oxidase) chemistry. Resonance Raman spectra were also obtained for T
OC
4
F
9
, to our knowledge, the first such spectra for any T species. The mechanism and substrate reactivity of T
OC
4
F
9
are compared to those of its bidentate counterpart, T
pin
F
, formed from K[Cu(pin
F
)(PR
3
)]. The monodentate derivative has both faster initial formation and more diverse substrate reactivity.},
author = {Brazeau, Sarah E.N. and Norwine, Emily E. and Hannigan, Steven F. and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Rukser, Dieter and Biebl, Florian and Grimm-Lebsanft, Benjamin and Praedel, Gregor and Teubner, Melissa and Rübhausen, Michael and Liebhäuser, Patricia and Rösener, Thomas and Stanek, Julia and Hoffmann, Alexander and Herres-Pawlis, Sonja and Doerrer, Linda H.},
doi = {10.1039/c9dt00516a},
faupublication = {yes},
journal = {Dalton Transactions},
note = {CRIS-Team Scopus Importer:2019-06-04},
pages = {6899-6909},
peerreviewed = {Yes},
title = {{Dual} oxidase/oxygenase reactivity and resonance {Raman} spectra of {Cu3O2} moiety with perfluoro-: {T} -butoxide ligands},
volume = {48},
year = {2019}
}
@article{faucris.201111565,
author = {Filipovic, Milos and Stancic, Ana and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and Masovic, Sava and Jankovic, Aleksandra and Otasevic, Vesna and Korac, Aleksandra and Buzadzic, Biljana and Korac, Bato},
doi = {10.1016/j.cbi.2017.05.003},
faupublication = {yes},
journal = {Chemico-Biological Interactions},
keywords = {L-arginine; Redox regulation; Diabetes; Skeletal muscle; SOD mimic},
pages = {188-196},
peerreviewed = {Yes},
title = {{Early} energy metabolism-related molecular events in skeletal muscle of diabetic rats: {The} effects of {L}-arginine and {SOD} mimic},
volume = {272},
year = {2017}
}
@article{faucris.121774664,
abstract = {Ferrocene-substituted porphyrin RL-91 exhibits antifungal activity against opportune human pathogen Candida albicans. RL-91 efficiently inhibits growth of both planktonic C. albicans cells and cells within biofilms without photoactivation. The minimal inhibitory concentration for plankton form (PMIC) was established to be 100 μg/mL and the same concentration killed 80% of sessile cells in the mature biofilm (SMIC80). Furthermore PMIC of RL-91 efficiently prevents C. albicans biofilm formation. RL-91 is cytotoxic for human fibroblasts in vitro in concentration of 10 μg/mL, however it does not cause hemolysis in concentrations of up to 50 μg/mL. These findings open possibility for application of RL-91 as an antifungal agent for external antibiofilm treatment of medical devices as well as a scaffold for further development of porphyrin based systemic antifungals. © 2014 Elsevier Ltd. All rights reserved.},
author = {Lippert, Rainer and Vojnovic, Sandra and Mitrovic, Aleksandra and Jux, Norbert and Ivanovic-Burmazovic, Ivana and Vasiljevic, Branka and Stankovic, Nada},
doi = {10.1016/j.bmcl.2014.05.061},
faupublication = {yes},
journal = {Bioorganic and Medicinal Chemistry Letters},
keywords = {Antifungal; Biofilm; Candida albicans; Ferrocene; Porphyrins},
pages = {3506-3511},
peerreviewed = {unknown},
title = {{Effect} of ferrocene-substituted porphyrin {RL}-91 on {Candida} albicans biofilm formation},
volume = {24},
year = {2014}
}
@article{faucris.107425824,
abstract = {For the first time, the effect of pressure on proton-coupled electron-transfer reactions of two selected seven-coordinate Fe (HL)(HO) systems [where HL = 2,6-diacetylpyridine-bis(semicarbazone) and 2,6-diacetylpyridine-bis(semioxamazide), respectively] was examined. The acid-base equilibria of the different Fe systems were investigated by spectrophotometric, potentiometric, and electrochemical titrations. On the basis of the obtained species distributions, the pH intervals in which the different protonated forms of the two studied systems exist were defined. In different pH ranges, a different number of protons (from 0 to 3 protons per electron) can be transferred during the redox process, which affects the change in the overall charge on the complexes. For all the different protonation forms of the studied complexes, the change in the redox potentials with pressure was measured and the redox reaction volume was obtained by high-pressure cyclic voltammetry. The results show that in the case of proton-coupled electron transfer, the reaction volume for the neutralization of protons contributes to the overall reaction volume. A linear correlation between Δz (change in the square of the charge) and the overall reaction volume of the complexes upon reduction, ΔV, was found. The average value of the intrinsic volume change for the selected seven-coordinate iron complexes was estimated from the intercept of the plot of ΔV versus Δz to be 9.2 ± 0.7 cm mol. For the combined redox and protonation processes, the data are discussed in terms of linear correlations between Δz and the redox and neutralization reaction volumes reported in the literature. © 2005 American Chemical Society.},
author = {Sarauli, David and Meier, Roland and Liu, Gaofeng and Ivanovic-Burmazovic, Ivana and van Eldik, Rudi},
doi = {10.1021/ic0507767},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {7624-7633},
peerreviewed = {Yes},
title = {{Effect} of pressure on proton-coupled electron transfer reactions of seven-coordinate iron complexes in aqueous solutions},
volume = {44},
year = {2005}
}
@article{faucris.117879784,
abstract = {Bis(pyrazolyl)methane ligands are excellent components of model complexes used to investigate the activity of the enzyme tyrosinase. Combining the N donors 3-tert-butylpyrazole and 1-methylimidazole results in a ligand that is capable of stabilising a (μ-η:η)-dicopper(II) core that resembles the active centre of tyrosinase. UV/Vis spectroscopy shows blueshifted UV bands in comparison to other known peroxo complexes, due to donor competition from different ligand substituents. This effect was investigated with the help of theoretical calculations, including DFT and natural transition orbital analysis. The peroxo complex acts as a catalyst capable of hydroxylating a variety of phenols by using oxygen. Catalytic conversion with the non-biological phenolic substrate 8-hydroxyquinoline resulted in remarkable turnover numbers. In stoichiometric reactions, substrate-binding kinetics was observed and the intrinsic hydroxylation constant, k, was determined for five phenolates. It was found to be the fastest hydroxylation model system determined so far, reaching almost biological activity. Furthermore, Hammett analysis proved the electrophilic character of the reaction. This sheds light on the subtle role of donor strength and its influence on hydroxylation activity.},
author = {Wilfer, Claudia and Liebhäuser, Patricia and Hoffmann, Alexander and Erdmann, Hannes and Grossmann, Oleg and Runtsch, Leander and Paffenholz, Eva and Schepper, Rahel and Dick, Regina and Bauer, Matthias and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Herres-Pawlis, Sonja},
doi = {10.1002/chem.201501685},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {biomimetic synthesis; copper; kinetics; N ligands; structure-activity relationships},
pages = {17639-17649},
peerreviewed = {unknown},
title = {{Efficient} {Biomimetic} {Hydroxylation} {Catalysis} with a {Bis}(pyrazolyl)imidazolylmethane {Copper} {Peroxide} {Complex}},
volume = {21},
year = {2015}
}
@article{faucris.109488324,
abstract = {A cobalt-porphyrin catalyst encapsulated in a cubic ML cage allows cyclopropanation reactions in aqueous media. The caged-catalyst shows enhanced activities in acetone/water as compared to pure acetone. Interestingly, the ML encapsulated catalyst reveals size-selectivity. Smaller substrates more easily penetrate through the pores of the "molecular ship-in-a-bottle catalysts" and are hence converted faster than bigger substrates. In addition, N-tosylhydrazone sodium salts are easy to handle reagents for cyclopropanation reactions under these conditions. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Otte, Matthias and Kuijpers, Petrus F. and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H. and de Bruin, Bas},
doi = {10.1002/chem.201400055},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {4880-4884},
peerreviewed = {unknown},
title = {{Encapsulated} cobalt-porphyrin as a catalyst for size-selective radical-type cyclopropanation reactions},
volume = {20},
year = {2014}
}
@article{faucris.121243804,
abstract = {The synthesis of a new, cubic ML cage is described. This new assembly was characterised by using NMR spectroscopy, DOSY, TGA, MS, and molecular modelling techniques. Interestingly, the enlarged cavity size of this new supramolecular assembly allows the selective encapsulation of tetra(4-pyridyl)metalloporphyrins (M(TPyP), M=Zn, Co). The obtained encapsulated cobalt-porphyrin embedded in the cubic zinc-porphyrin assembly is the first example of a catalytically active encapsulated transition-metal complex in a cubic ML cage. The substrate accessibility of this system was demonstrated through radical-trapping experiments, and its catalytic activity was demonstrated in two different radical-type transformations. The reactivity of the encapsulated Co(TPyP) complex is significantly increased compared to free Co(TPyP) and other cobalt-porphyrin complexes. The reactions catalysed by this system are the first examples of cobalt-porphyrin-catalysed radical-type transformations involving diazo compounds which occur inside a supramolecular cage. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Otte, Matthias and Kuijpers, Petrus F. and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H. and de Bruin, Bas},
doi = {10.1002/chem.201301411},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {10170-10178},
peerreviewed = {Yes},
title = {{Encapsulation} of metalloporphyrins in a self-assembled cubic {M} {8L6} cage: {A} new molecular flask for cobalt-porphyrin- catalysed radical-type reactions},
volume = {19},
year = {2013}
}
@article{faucris.264859078,
abstract = {With a view to developing multimetallic molecular catalysts that mimic the oxygen-evolving catalyst (OEC) in Nature's photosystem II, the synthesis of various dicubanoid manganese clusters is described and their catalytic activity investigated for water oxidation in basic, aqueous solution. Pyridinemethanol-based ligands are known to support polynuclear and cubanoid structures in manganese coordination chemistry. The chelators 2,6-pyridinedimethanol (H2L1) and 6-methyl-2-pyridinemethanol (HL2) were chosen to yield polynuclear manganese complexes; namely, the tetranuclear defective dicubanes [MnII2MnIII2(HL1)4(OAc)4(OMe)2] and [MnII2MnIII2(HL1)6(OAc)2] (OAc)2⋅2 H2O, as well as the octanuclear-dicubanoid [MnII6MnIII2(L2)4(O)2(OAc)10(HOMe/OH2)2]⋅3MeOH⋅MeCN. In freshly prepared solutions, polynuclear species were detected by electrospray ionization mass spectrometry, whereas X-band electron paramagnetic resonance studies in dilute, liquid solution suggested the presence of divalent mononuclear Mn species with g values of 2. However, the magnetochemical investigation of the complexes’ solutions by the Evans technique confirmed a haphazard combination of manganese coordination complexes, from mononuclear to polynuclear species. Subsequently, the newly synthesized and characterized manganese molecular complexes were employed as precursors to prepare electrode-deposited films in a buffer-free solution to evaluate and compare their stability and catalytic activity for water oxidation electrocatalysis.},
author = {Hosseinmardi, Soosan and Scheurer, Andreas and Heinemann, Frank Wilhelm and Kuepper, Karsten and Senft, Laura and Waldschmidt, Pablo and Ivanovic-Burmazovic, Ivana and Meyer, Karsten},
doi = {10.1002/cssc.202101451},
faupublication = {yes},
journal = {Chemsuschem},
keywords = {cubanes; electrocatalysis; electrodeposition; manganese; water splitting},
note = {CRIS-Team Scopus Importer:2021-10-08},
peerreviewed = {Yes},
title = {{Evaluation} of {Manganese} {Cubanoid} {Clusters} for {Water} {Oxidation} {Catalysis}: {From} {Well}-{Defined} {Molecular} {Coordination} {Complexes} to {Catalytically} {Active} {Amorphous} {Films}},
year = {2021}
}
@article{faucris.238898108,
abstract = {The enzyme tyrosinase contains a reactive side-on peroxo dicopper(II) center as catalytically active species in C−H oxygenation reactions. The tyrosinase activity of the isomeric bis(μ-oxo) dicopper(III) form has been discussed controversially. The synthesis of bis(μ-oxo) dicopper(III) species [Cu2(μ-O)2(L1)2](X)2 ([O1](X)2, X=PF6 − , BF4 −, OTf−, ClO4 −), stabilized by the new hybrid guanidine ligand 2-{2-((dimethylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (L1), and its characterization by UV/Vis, Raman, and XAS spectroscopy, as well as cryo-UHR-ESI mass spectrometry, is described. We highlight selective oxygenation of a plethora of phenolic substrates mediated by [O1](PF6)2, which results in mono- and bicyclic quinones and provides an attractive strategy for designing new phenazines. The selectivity is predicted by using the Fukui function, which is hereby introduced into tyrosinase model chemistry. Our bioinspired catalysis harnesses molecular dioxygen for organic transformations and achieves a substrate diversity reaching far beyond the scope of the enzyme.},
author = {Paul, Melanie and Teubner, Melissa and Grimm-Lebsanft, Benjamin and Golchert, Christiane and Meiners, Yannick and Senft, Laura and Keisers, Kristina and Liebhaeuser, Patricia and Roesener, Thomas and Biebl, Florian and Buchenau, Soeren and Naumova, Maria and Murzin, Vadim and Krug, Roxanne and Hoffmann, Alexander and Pietruszka, Joerg and Ivanovic-Burmazovic, Ivana and Ruebhausen, Michael and Herres-Pawlis, Sonja},
doi = {10.1002/chem.202000664},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {copper catalysis; dioxygen activation; guanidines; phenazines; tyrosinase},
note = {CRIS-Team Scopus Importer:2020-06-02},
peerreviewed = {Yes},
title = {{Exceptional} {Substrate} {Diversity} in {Oxygenation} {Reactions} {Catalyzed} by a {Bis}(μ-oxo) {Copper} {Complex}},
year = {2020}
}
@article{faucris.222101501,
abstract = {Cytochrome c oxidase (CcO) catalyzes the reduction of dioxygen to water utilizing a heterobinuclear active site composed of a heme moiety and a mononuclear copper center coordinated to three histidine residues, one of which is covalently cross-linked to a tyrosine residue via a post-translational modification (PTM). Although this tyrosine-histidine moiety has functional and structural importance, the pathway behind this net oxidative C-N bond coupling is still unknown. A novel route employing an iron(III) meso-substituted isoporphyrin derivative, isoelectronic with Cmpd-I ((Por•+)FeIV=O), is for the first time proposed to be a key intermediate in the Tyr-His cofactor biogenesis. Newly synthesized iron(III) meso-substituted isoporphyrins were prepared with azide, cyanide, and substituted imidazole functionalities, by adding nucleophiles to an iron(III) π-dication species formed via addition of trifluoroacetic acid to F8Cmpd-I (F8 = (tetrakis(2,6-difluorophenyl)porphyrinate)). Isoporphyrin derivatives were characterized at cryogenic temperatures via ESI-MS and UV-vis, 2H NMR, and EPR spectroscopies. Addition of 1,3,5-trimethoxybenzene or 4-methoxyphenol to the imidazole-substituted isoporphyrin led to formation of the organic product containing the imidazole coupled to aromatic substrate via a new C-N bond, as detected via cryo-ESI-MS. Experimental evidence for the formation of an imidazole-substituted isoporphyrin and its promising reactivity to form the imidazole-phenol coupled product yields viability to the herein proposed pathway behind the PTM (i.e., biogenesis) leading to the key covalent Tyr-His cross-link in CcO.},
author = {Ehudin, Melanie A. and Senft, Laura and Franke, Alicja and Ivanovic-Burmazovic, Ivana and Karlin, Kenneth D.},
doi = {10.1021/jacs.9b01791},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2019-07-12},
peerreviewed = {Yes},
title = {{Formation} and {Reactivity} of {New} {Isoporphyrins}: {Implications} for {Understanding} the {Tyr}-{His} {Cross}-{Link} {Cofactor} {Biogenesis} in {Cytochrome} c {Oxidase}},
year = {2019}
}
@article{faucris.121533984,
abstract = {A novel polycationic [60]fullerene hexakis-adduct has been synthesized and investigated by electrospray ionization and tandem mass spectrometry. The polycationic ligand system comprises 12 pre-formed positive charges, compensated in the neutral molecule by bromide anions. Stable quasi-molecular cations were obtained through the release of the anionic counter ions covering a charge-state envelope from 3+ to 12+. Collision-induced dissociation experiments revealed three fragmentation pathways. A dominant neutral loss channel leads to daughter ions of the same charge state as the highly charged precursor ion and singly charged daughter ions can be expelled from the polycations through two distinct dissociation channels involving both the neutral and the charge-carrying part of their ligands.},
author = {Li, Jing and Nye, Leanne C. and Wasserthal, Lennard and Vinh, Chau and Kirschbaum, Rolf and Ivanovic-Burmazovic, Ivana and Hirsch, Andreas and Drewello, Thomas},
doi = {10.1002/ejoc.201500102},
faupublication = {yes},
journal = {European Journal of Organic Chemistry},
keywords = {Electrospray ionization; Fullerenes; Mass spectrometry; Polycations},
pages = {2282-2290},
peerreviewed = {Yes},
title = {{Formation} of highly charged quasi-molecular ions of a polycationic [60]fullerene hexakis-adduct and their fragmentation behavior in the gas phase},
volume = {2015},
year = {2015}
}
@article{faucris.242410447,
abstract = {Geodesic nitrogen-containing graphene fragments are interesting candidates for various material applications, but the available synthetic protocols, which need to overcome intrinsic strain energy during the formation of the bowl-shaped skeletons, are often incompatible with heteroatom-embedded structures. Through this mass spectrometry-based gas-phase study, we show by means of collision-induced dissociation experiments and supported by density functional theory calculations, the first evidence for the formation of a porphyrin-embedded conical nanocarbon. The influences of metalation and functionalization of the used tetrabenzoporphyrins have been investigated, which revealed different cyclization efficiencies, different ionization possibilities, and a variation of the dissociation pathway. Our results suggest a stepwise process for HF elimination from the fjord region, which supports a selective pathway towards bent nitrogen-containing graphene fragments.},
author = {Lungerich, Dominik and Hitzenberger, Jakob and Ruppel, Michael and Döpper, Tibor and Witt, Matthias and Ivanovic-Burmazovic, Ivana and Görling, Andreas and Jux, Norbert and Drewello, Thomas},
doi = {10.1002/chem.202002638},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {annulenes; collision-induced dissociation; C−F activation; mass spectrometry; polycyclic aromatic hydrocarbons; porphyrinoids},
note = {CRIS-Team Scopus Importer:2020-09-11},
peerreviewed = {Yes},
title = {{Gas}-{Phase} {Transformation} of {Fluorinated} {Benzoporphyrins} to {Porphyrin}-{Embedded} {Conical} {Nanocarbons}},
year = {2020}
}
@article{faucris.108720524,
abstract = {Taking NO for an answer: A mechanistic study has shown that a heme-iron-catalyzed pathway (see scheme) could lead to the nitrite-/sulfide- induced formation of NO and HNO within mitochondria, and suggests that H S may be the elusive thiol responsible for the reduction of nitrite. This study offers an answer to the decades-old question on the role of nitrite in the treatment of HS poisoning. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Miljkovic, Jan and Kenkel, Isabell and Ivanovic-Burmazovic, Ivana and Filipovic, Milos},
doi = {10.1002/anie.201305669},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {12061-12064},
peerreviewed = {Yes},
title = {{Generation} of {HNO} and {HSNO} from nitrite by heme-iron-catalyzed metabolism with {H2S}},
volume = {52},
year = {2013}
}
@article{faucris.120805124,
abstract = {Nanospheres can be formed by combining 24 bispyridinyl building blocks with a palladium or platinum precursor. These spheres can be functionalized on the inside with a gold(I) chloride complex leading to a high local concentration of gold(I) complexes. The high local concentration makes the neutral gold species an active catalyst. Furthermore, the platinum-gold spheres can be post-modified with a silver(I) salt to form cationic gold(I) catalysts. The platinum assemblies are demonstrated to be stable in the presence of various substrates and as a result several cyclization reactions have been carried out using these new spheres as catalysts. Higher conversions in a [4+2] cycloaddition are observed for the sphere catalyst compared to the mono-nuclear analogues. Also the cyclization of 1,6-enynes can be facilitated by the confined gold catalyst and high activity is observed in the activation of allenes. For the lactonization of alkynoic acids, a different selectivity is observed compared to a standard gold(I) complex, demonstrating that the high local concentration due to a confined space can induce other selectivity in catalysis.},
author = {Leenders, Stefan H.A.M and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H.},
doi = {10.1002/adsc.201600071},
faupublication = {yes},
journal = {dvanced Synthesis & Catalysis},
keywords = {cyclization reactions; gold catalysis; local concentration; nanospheres; supramolecular catalysis},
pages = {1509-1518},
peerreviewed = {unknown},
title = {{Gold} {Functionalized} {Platinum} {M12L24}-{Nanospheres} and {Their} {Application} in {Cyclization} {Reactions}},
volume = {358},
year = {2016}
}
@article{faucris.122658404,
abstract = {Homogeneous transition-metal catalysis is a crucial technology for the sustainable preparation of valuable chemicals. The catalyst concentration is usually kept as low as possible, typically at mm or mm levels, and the effect of high catalyst concentration is hardly exploited because of solubility issues and the inherent unfavorable catalyst/substrate ratio. Herein, a self-assembly strategy is reported which leads to local catalyst concentrations ranging from 0.05m to 1.1m, inside well-defined nanospheres, whilst the overall catalyst concentration in solution remains at the conventional mm levels. We disclose that only at this high concentration, the gold(I) chloride is reactive and shows high selectivity in intramolecular C-O and C-C bond-forming cyclization reactions.},
author = {Gramage-Doria, Rafael and Hessels, Joeri and Leenders, Stefan H.A.M and Tröppner, Oliver and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H.},
doi = {10.1002/anie.201406415},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {Gold; Homogeneous catalysis; Metal-metal interactions; Nanostructures; Supramolecular chemistry},
pages = {13380-13384},
peerreviewed = {unknown},
title = {{Gold}({I}) catalysis at extreme concentrations inside self-assembled nanospheres},
volume = {53},
year = {2014}
}
@article{faucris.122658624,
abstract = {Nitroxyl (HNO) is a redox sibling of nitric oxide (NO) that targets distinct signalling pathways with pharmacological endpoints of high significance in the treatment of heart failure. Beneficial HNO effects depend, in part, on its ability to release calcitonin gene-related peptide (CGRP) through an unidentified mechanism. Here we propose that HNO is generated as a result of the reaction of the two gasotransmitters NO and H 2 S. We show that H 2 S and NO production colocalizes with transient receptor potential channel A1 (TRPA1), and that HNO activates the sensory chemoreceptor channel TRPA1 via formation of amino-terminal disulphide bonds, which results in sustained calcium influx. As a consequence, CGRP is released, which induces local and systemic vasodilation. H 2 S-evoked vasodilatatory effects largely depend on NO production and activation of HNO-TRPA1-CGRP pathway. We propose that this neuroendocrine HNO-TRPA1-CGRP signalling pathway constitutes an essential element for the control of vascular tone throughout the cardiovascular system. © 2014 Macmillan Publishers Limited. All rights reserved.},
author = {Eberhard, Miriam and Dux, Maria and Namer, Barbara and Miljkovic, Jan and Cordasic, Nada and Will, Christine and Kichko, Tetyana and de la Roche, Jeanne and Fischer, Michael Jochen Marco and Suarez, Sebastian A. and Bikiel, Damian and Dorsch, Karola and Leffler, Andreas and Babes, Alexandru and Lampert, Angelika and Lennerz, Jochen K. and Jacobi, Johannes and Marti, Marcelo A. and Doctorovich, Fabio and Högestätt, Edward D. and Zygmunt, Peter M. and Ivanovic-Burmazovic, Ivana and Meßlinger, Karl and Reeh, Peter and Filipovic, Milos},
doi = {10.1038/ncomms5381},
faupublication = {yes},
journal = {Nature Communications},
peerreviewed = {Yes},
title = {{H2S} and {NO} cooperatively regulate vascular tone by activating a neuroendocrine {HNO}-{TRPA1}-{CGRP} signalling pathway},
volume = {5},
year = {2014}
}
@article{faucris.117873624,
abstract = {New facile methods to prepare iron sulphur halide clusters [Fe4S4X4](2-) from [Fe(CO)5] and elemental sulphur were elaborated. Reactions of ferrous precursors like tetrahalidoferrates(ii) or simple ferrous halides with [Fe(CO)5] and sulphur turned out to be efficient methods to prepare homoleptic [Fe4S4X4](2-) (X = Cl, Br) and heteroleptic clusters [Fe4S4X4-nYn](2-) (X = Cl, Br; Y = Br, I). Solid materials were obtained as salts of BTMA(+) (= benzyltrimethylammonium); the new compounds containing [Fe4S4Br4](2-) and [Fe4S4X2Y2](2-) (X, Y = Cl, Br, I) were all isostructural to (BTMA)2[Fe4S4I4] (monoclinic, Cc) as inferred from synchrotron X-ray powder diffraction. While the solid materials contain defined heteroleptic clusters with a halide X : Y ratio of 2 : 2, dissolving these compounds leads to rapid scrambling of the halide ligands forming mixtures of all five possible [Fe4S4X4-nYn](2-) clusters as could be shown by UHR-ESI MS. The variation of X and Y allowed assignment of the absorption bands in the visible and NIR; the long-wavelength bands around 1100 nm were tentatively assigned to intervalence charge transfer (IVCT) transitions.},
author = {Schueren, Andreas O. and Gramm, Verena K. and Dürr, Maximilian and Foi, Ana and Ivanovic-Burmazovic, Ivana and Doctorovich, Fabio and Rucschewitz, Uwe and Klein, Axel},
doi = {10.1039/c5dt02769a},
faupublication = {yes},
journal = {Dalton Transactions},
month = {Jan},
pages = {361-75},
peerreviewed = {unknown},
title = {{Halide} coordinated homoleptic [{Fe4S4X4}](2-) and heteroleptic [{Fe4S4X2Y2}](2-) clusters ({X}, {Y} = {Cl}, {Br}, {I})--alternative preparations, structural analogies and spectroscopic properties in solution and solid state.},
volume = {45},
year = {2016}
}
@article{faucris.111881044,
abstract = {In this work, electrochemical studies on the seven-coordinate iron complex (Fe III/II dapsox), a functional model for the superoxide dismutase enzyme (SOD mimetic), were performed in an aqueous solution over the pH range 1 - 12 (with and without buffers) to conceive the underlying heterogeneous proton-coupled electron transfer (PCET) processes of various complex species. The thermodynamics of the corresponding proton transfer, electron transfer, and PCET processes have been evaluated as well as the kinetics of related heterogeneous electrode reactions of all complex species in solution. Measurements in D 2 O have also been carried out for selected redox couples to assess a possible kinetic isotope effect (KIE). In the case of a two-proton one-electron transfer process in the absence of a buffer, the KIE was found to be 4.8, whereas in the case of a one-proton one-electron transfer process in buffered solutions, an inverse KIE was observed. The overall data suggest the operation of a concerted PCET mechanism for the two-proton one-electron transfer process, whereas involvement of an H-bonded precursor adduct formed between the buffer components, and the complex species within a one-proton one-electron transfer mechanism is feasible. These results shed light on both the enzymatic and the mimetic SOD mechanisms, speaking in favor of the two-proton one-electron transfer process as a desirable mechanism for efficient catalytic superoxide dismutation. © 2012 Walter de Gruyter GmbH, Berlin/Boston.},
author = {Sarauli, David and van Eldik, Rudi and Ivanovic-Burmazovic, Ivana},
doi = {10.1515/irm-2012-0008},
faupublication = {yes},
journal = {Inorganic Reaction Mechanisms},
pages = {107-124},
peerreviewed = {Yes},
title = {{Heterogeneous} proton-coupled electron transfer in seven-coordinate iron superoxide dismutase mimetics: {Concerted} mechanism for two-proton one-electron transfer},
volume = {8},
year = {2012}
}
@article{faucris.120215744,
abstract = {(Figure Presented) Fullerene antioxidants: A direct correlation between the redox and structural properties of water-soluble fullerenes (see picture) and their reactivity towards superoxide is demonstrated. Some of the C monoadducts examined act as superoxide dismutase mimetics. The findings establish a guide for designing fullerene derivatives to catalytically decompose the superoxide radical anion. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.},
author = {Liu, Gaofeng and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and Beuerle, Florian and Witte, Patrick and Hirsch, Andreas},
doi = {10.1002/anie.200800008},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {3991-3994},
peerreviewed = {Yes},
title = {{High} catalytic activity of dendritic {C60} monoadducts in metal-free superoxide dismutation},
volume = {47},
year = {2008}
}
@article{faucris.241998165,
abstract = {Hydrogenase enzymes are excellent proton reduction catalysts and therefore provide clear blueprints for the development of nature-inspired synthetic analogues. Mimicking their catalytic center is straightforward but mimicking the protein matrix around the active site and all its functions remains challenging. Synthetic models lack this precisely controlled second coordination sphere that provides substrate preorganization and catalyst stability and, as a result, their performances are far from those of the natural enzyme. In this contribution, we report a strategy to easily introduce a specific yet customizable second coordination sphere around synthetic hydrogenase models by encapsulation inside M12L24 cages and, at the same time, create a proton-rich nano-environment by co-encapsulation of ammonium salts, effectively providing substrate preorganization and intermediates stabilization. We show that catalyst encapsulation in these nanocages reduces the catalytic overpotential for proton reduction by 250 mV as compared to the uncaged catalyst, while the proton-rich nano-environment created around the catalyst ensures that high catalytic rates are maintained.},
author = {Zaffaroni, Riccardo and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H.},
doi = {10.1002/ange.202008298},
faupublication = {yes},
journal = {Angewandte Chemie},
keywords = {catalysis; hydrogenases; proton reduction; substrate preorganization; supramolecular cages},
note = {CRIS-Team Scopus Importer:2020-08-28},
peerreviewed = {Yes},
title = {{Hydrogenase} {Mimics} in {M12L24} {Nanospheres} to {Control} {Overpotential} and {Activity} in {Proton}-{Reduction} {Catalysis}},
year = {2020}
}
@article{faucris.242210434,
abstract = {Hydrogenase enzymes are excellent proton reduction catalysts and therefore provide clear blueprints for the development of nature-inspired synthetic analogues. Mimicking their catalytic center is straightforward but mimicking the protein matrix around the active site and all its functions remains challenging. Synthetic models lack this precisely controlled second coordination sphere that provides substrate preorganization and catalyst stability and, as a result, their performances are far from those of the natural enzyme. In this contribution, we report a strategy to easily introduce a specific yet customizable second coordination sphere around synthetic hydrogenase models by encapsulation inside M(12)L(24)cages and, at the same time, create a proton-rich nano-environment by co-encapsulation of ammonium salts, effectively providing substrate preorganization and intermediates stabilization. We show that catalyst encapsulation in these nanocages reduces the catalytic overpotential for proton reduction by 250 mV as compared to the uncaged catalyst, while the proton-rich nano-environment created around the catalyst ensures that high catalytic rates are maintained.},
author = {Zaffaroni, Riccardo and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Reek, Joost N. H.},
doi = {10.1002/anie.202008298},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
note = {CRIS-Team WoS Importer:2020-09-04},
peerreviewed = {Yes},
title = {{Hydrogenase} {Mimics} in {M}(12){L}(24){Nanospheres} to {Control} {Overpotential} and {Activity} in {Proton}-{Reduction} {Catalysis}},
year = {2020}
}
@article{faucris.117880004,
author = {Scheerer, Stefan and Linseis, Michael and Wuttke, Evelyn and Weickert, Sabrina and Drescher, Malte and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Irmler, Andreas and Pauly, Fabian and Winter, Rainer F},
doi = {10.1002/chem.201602415},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {(spectro)electrochemistry; density functional calculations; electrochromism; metallamacrocycle; paramagnetism},
peerreviewed = {unknown},
title = {{Inside} {Back} {Cover}: {Redox}-{Active} {Tetraruthenium} {Macrocycles} {Built} from 1,4-{Divinylphenylene}-{Bridged} {Diruthenium} {Complexes} ({Chem}. {Eur}. {J}. 28/2016)},
volume = {22},
year = {2016}
}
@article{faucris.241003265,
abstract = {A conjugate of a Mn-based superoxide dismutase mimic with a Re-based multimodal probe1{\_}was studied in a cellular model of oxidative stress. Its speciation was investigated using Re and Mn X-fluorescence. Interestingly,1{\_}shows a distribution different from its unconjugated analogue but a similar concentration in mitochondria and a similar bioactivity.},
author = {Mathieu, Emilie and Bernard, Anne-Sophie and Quevrain, Elodie and Zoumpoulaki, Martha and Iriart, Sebastien and Lung-Soong, Caroline and Lai, Barry and Medjoubi, Kadda and Henry, Lucas and Nagarajan, Sounderya and Poyer, Florent and Scheitler, Andreas and Ivanovic-Burmazovic, Ivana and Marco, Sergio and Somogyi, Andrea and Seksik, Philippe and Delsuc, Nicolas and Policar, Clotilde},
doi = {10.1039/d0cc03398g},
faupublication = {yes},
journal = {Chemical Communications},
note = {CRIS-Team WoS Importer:2020-07-31},
pages = {7885-7888},
peerreviewed = {Yes},
title = {{Intracellular} location matters: rationalization of the anti-inflammatory activity of a manganese(ii) superoxide dismutase mimic complex},
volume = {56},
year = {2020}
}
@article{faucris.107435284,
abstract = {The synthesis and characterization of the Fe(III) complex of a novel crown ether-porphyrin conjugate, 5-N-(4-aza-18-crown-6)methyl-5 ,10,15,20-tetra-tert-butyl- 5-methyl-5,10,15,20-tetraphenylporphyrin (HPorph), as well as the corresponding hydroxo, dimeric, Fe(II), and peroxo species are reported. The crystal structure of [Fe(Porph)Cl]·H O·FeCl·C H·EtOH is also reported. [Fe(Porph) (DMSO)] and K[Fe(Porph)(O)] are high-spin species (Mössbauer data: δ = 0.38 mm s, ΔE = 0.83 mm s and δ = 0.41 mm s, ΔE = 0.51 mm s, respectively), whereas in a solution of reduced [Fe(Porph)-(DMSO) ] complex the low-spin [Fe(Porph)(DMSO) ] (δ = 0.44 mm s, ΔE = 1.32 mm s) and high-spin [Fe(Porph)(DMSO)] (δ = 1.27 mm s ΔE = 3.13 mm s) iron(II) species are observed. The reaction of [Fe(Porph)(DMSO)] with KO in DMSO has been investigated. The first reaction step, involving reduction to [Fe(Porph)(DMSO) ], was not investigated in detail because of parallel formation of an Fe-(III)-hydroxo species. The kinetics and thermodynamics of the second reaction step, reversible binding of superoxide to the Fe(II) complex and formation of an Fe(III)-peroxo species, were studied in detail (by stopped-flow time-resolved UV/vis measurements in DMSO at 25°C), resulting in k = 36 500 ± 500 M s, k = 0.21 ± 0.01 s (direct measurements using an acid as a superoxide scavenger), and K = (1.7 ± 0.2) × 10 (superoxide binding constant kinetically obtained as k/k), (1.4 ± 0.1) × 10, and (9.0 ± 0.1) × 10 M (thermodynamically obtained in the absence and in the presence of 0.1 M NBuPF , respectively). Temperature-dependent kinetic measurements for k (-40 to 25°C in 3:7 DMSO/CHCN mixture) yielded the activation parameters ΔH = 61.2 ± 0.9 kJ mol and ΔS = +48 ± 3 J K mol. The observed reversible binding of superoxide to the metal center and the obtained kinetic and thermodynamic parameters are unique. The finding that fine-tuning of the proton concentration can cause the Fe(III)-peroxo species to release O and form an Fe(II) species is of biological interest, since this process might occur under very specific physiological conditions. © 2007 American Chemical Society.},
author = {Dürr, Katharina L. and Macpherson, Brendan P. and Warratz, Ralf and Hampel, Frank and Tuczek, Felix and Helmreich, Matthias and Jux, Norbert and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ja064984p},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {4217-4228},
peerreviewed = {Yes},
title = {{Iron}({III}) complex of a crown ether-porphyrin conjugate and reversible binding of superoxide to its iron({II}) form},
volume = {129},
year = {2007}
}
@article{faucris.120216184,
abstract = {Mitochondria play an important role in sperm cell maturation and function. Here, we examined whether (and how) changes in sperm redox milieu affect the functional status of sperm mitochondria, that is, sperm functionality. Compared with the control, incubation in Tyrode's medium for 3 h, under noncapacitating conditions, decreased sperm motility, the amount of nitric oxide (.NO), the number of MitoTracker Green FM (MT-G) positive mitochondria, and the expression of complexes I and IV of the mitochondrial respiratory chain. In turn, superoxide dismutase (SOD) mimic (M40403) treatment restored/increased these parameters, as well as the expression of endothelial nitric oxide synthase, manganese SOD, and catalase. These data lead to the hypothesis that M40403 improves mitochondrial functional state and motility of spermatozoa, as well as.NO might be involved in the observed effects of the mimic. © 2013, Mary Ann Liebert, Inc.},
author = {Otasevic, Vesna and Korac, Aleksandra and Vucetic, Milica and MacAnovic, Biljana and Garalejic, Eliana and Ivanovic-Burmazovic, Ivana and Filipovic, Milos and Buzadzic, Biljana and Stancic, Ana and Jankovic, Aleksandra and Velickovic, Ksenija and Golic, Igor and Markelic, Milica and Korac, Bato},
doi = {10.1089/ars.2012.4684},
faupublication = {yes},
journal = {Antioxidants & Redox Signaling},
pages = {170-178},
peerreviewed = {Yes},
title = {{Is} manganese ({II}) pentaazamacrocyclic superoxide dismutase mimic beneficial for human sperm mitochondria function and motility?},
volume = {18},
year = {2013}
}
@article{faucris.120216624,
abstract = {A detailed kinetic study of the protonation and subsequent reductive elimination reaction of a (diimine)platinum(II) dimethyl complex was undertaken in dichloromethane over the temperature range of -90 to +10°C by stopped-flow techniques. Time-resolved UV-vis monitoring of the reaction allowed the assessment of the effects of acid concentration, coordinating solvent (MeCN) concentration, temperature, and pressure. The second-order rate constant for the protonation step was determined to be 15200 ± 400 M s at -78°C, and the corresponding activation parameters are ΔH = 15.2 ± 0.6 kJ mol and ΔS = -85 ± 3 J mol K, which are in agreement with the addition of a proton that results in the formation of the platinum(IV) hydrido complex. The kinetics of the second, methane-releasing reaction step do not show an acid dependence, and the MeCN concentration also does not significantly affect the reaction rate. The activation parameters for the second reaction step were found to be ΔH = 75 ± 1 kJ mol, ΔS = +38 ± 5 J mol K, and ΔV = +18 ± 1 cm mol, strongly suggesting a dissociative character of the rate-determining step for the reductive elimination reaction. The spectroscopic and kinetic observations were correlated with NMR data and assisted the elucidation of the underlying reaction mechanism. © 2006 American Chemical Society.},
author = {Wik, Bror J. and Ivanovic-Burmazovic, Ivana and Tilset, M. and van Eldik, Rudi},
doi = {10.1021/ic0519537},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {3613-3621},
peerreviewed = {Yes},
title = {{Mechanistic} information from low-temperature rapid-scan and {NMR} measurements on the protonation and subsequent reductive elimination reaction of a (diimine)platinum({II}) dimethyl complex},
volume = {45},
year = {2006}
}
@article{faucris.120220584,
abstract = {In the molecule of the title compound, [MoO(L)(CH-OH)] [L is the dianion of 2′-(2-benzoyl-1-methylethyl-idene)-1-naphthohydrazide, CHNO], the Mo atom displays distorted octahedral coordination geometry, being coordinated by two mutually cis oxo ligands, the methanol O atom and the tridentate ligand L bonded through the azomethine N atom, the enolic O atom and the oxazine O atom (equatorially disposed). The packing in the crystal structure involves a hydrogen bond from the methanol OH as donor to an oxo ligand as acceptor.},
author = {Prelesnik, Bogdan and Ivanovic-Burmazovic, Ivana and Leovac, V. and Andjelkovic, K.},
faupublication = {no},
journal = {Acta Crystallographica Section C: Crystal Structure Communications},
pages = {1375-1377},
peerreviewed = {Yes},
title = {mer-[2′-(2-benzoyl-1-methylethylidene)-1-naphthohydrazido(2-)] (methanol)-cis-dioxomolybdenum({VI})},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-3142570781&origin=inward},
volume = {52},
year = {1996}
}
@article{faucris.120217284,
abstract = {Transition metal centres are one of the primary targets for nitric oxide (NO), superoxide (Ȯ) and hydrogen peroxide (H O), which are small molecules present in a biological milieu, and of industrial and environmental interest. Coordination to a metal centre modulates their redox behaviour in such a way that they become activated for an inner-sphere oxidation or reduction, depending on the electronic and redox properties of a particular transition metal ion. Since the related redox reactions play multiple roles in physiological and pathophysiological processes, as well as in chemical catalysis in terms of synthetic applications and exhaust gas purification, the elucidation of the mechanisms of the elementary reaction steps behind these complex processes is of fundamental importance. This review concentrates on our work in this area, where by applying low temperature and high pressure kinetic and thermodynamic techniques we shed more light on the mechanisms of the particular reaction steps involved in the activation of NO, Ȯ and various peroxides. The studies include work on solvent exchange reactions that control the binding of small molecules to the metal centre and subsequent electron-transfer processes. We paid special attention to different iron and manganese complexes with heme and non-heme ligand systems. © The Royal Society of Chemistry.},
author = {Ivanovic-Burmazovic, Ivana and van Eldik, Rudi},
doi = {10.1039/b805450a},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {5259-5275},
peerreviewed = {Yes},
title = {{Metal} complex-assisted activation of small molecules. from {NO} to superoxide and peroxides},
volume = {null},
year = {2008}
}
@article{faucris.120217504,
abstract = {The photochemical properties of homo- and heterometallic molybdate-based Lindqvist polyoxometalate clusters are investigated in a comparative study and it is shown that vanadium substitution can be used as a facile synthetic tool to optimize the visible light absorption and photocatalytic activity of the cluster. The mono-vanadium substituted unit, [VMoO ] shows light absorption up to 480 nm whereas the light absorption of the molybdate analogue [MoO] is mainly in the UV region below 400 nm. The electronic absorption properties of both clusters are further investigated using TD-DFT calculations which show that vanadium incorporation leads to the formation of low-energy O → V LMCT transitions. In comparative photochemical dye decomposition test reactions under UV and Vis irradiation, a higher reactivity is observed for [VMoO] together with turnover numbers of more than 1600. In addition it is shown that under anaerobic conditions, the photoreaction proceeds faster than in the presence of oxygen, suggesting that oxygen acts as a quencher in one of the photoredox steps. © 2012 The Royal Society of Chemistry.},
author = {Tucher, Johannes and Wu, Yanlin and Nye, Leanne and Ivanovic-Burmazovic, Ivana and Khusniyarov, Marat and Streb, Carsten},
doi = {10.1039/c2dt30304c},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {9938-9943},
peerreviewed = {Yes},
title = {{Metal} substitution in a {Lindqvist} polyoxometalate leads to improved photocatalytic performance},
volume = {41},
year = {2012}
}
@article{faucris.121246004,
abstract = {Neuropathic pain can develop as an agonizing sequela of diabetes mellitus and chronic uremia. A chemical link between both conditions of altered metabolism is the highly reactive compound methylglyoxal (MG), which accumulates in all cells, in particular neurons, and leaks into plasma as an index of the severity of the disorder. The electrophilic structure of this cytotoxic ketoaldehyde suggests TRPA1, a receptor channel deeply involved in inflammatory and neuropathic pain, as a molecular target. We demonstrate that extracellularly applied MG accesses specific intracellular binding sites of TRPA1, activating inward currents and calcium influx in transfected cells and sensory neurons, slowing conduction velocity in unmyelinated peripheral nerve fibers, and stimulating release of proinflammatory neuropeptides from and action potential firing in cutaneous nociceptors. Using a model peptide of the N terminus of human TRPA1, we demonstrate the formation of disulfide bonds based on MG-induced modification of cysteines as a novel mechanism. In conclusion, MG is proposed to be a candidate metabolite that causes neuropathic pain in metabolic disorders and thus is a promising target for medicinal chemistry. © 2012 by The American Society for Biochemistry and Molecular Biology, Inc.},
author = {Eberhardt, Mirjam and Filipovic, Milos and Leffler, Andreas and de la Roche, Jeanne and Kistner, Katrin and Fischer, Michael Jochen Marco and Fleming, Thomas and Zimmermann, Katharina and Ivanovic-Burmazovic, Ivana and Nawroth, Peter P. and Bierhaus, Angelika and Reeh, Peter and Sauer, Susanne},
doi = {10.1074/jbc.M111.328674},
faupublication = {yes},
journal = {Journal of Biological Chemistry},
pages = {28291-28306},
peerreviewed = {Yes},
title = {{Methylglyoxal} activates nociceptors through transient receptor potential channel {A1} ({TRPA1}): {A} possible mechanism of metabolic neuropathies},
volume = {287},
year = {2012}
}
@inproceedings{faucris.214609303,
address = {CAMBRIDGE},
author = {Ok, Kiwon and Li, Wenjing and Shimberg, Geoffrey D. and Batelu, Sharon and Lange, Mike and Ivanovic-Burmazovic, Ivana and Stemmler, Timothy and Kane, Maureen A. and Filipovic, Milos R. and Michel, Sarah L.},
booktitle = {BIOPHYSICAL JOURNAL},
date = {2019-03-02/2019-03-06},
doi = {10.1016/j.bpj.2018.11.2591},
faupublication = {yes},
note = {CRIS-Team WoS Importer:2019-03-26},
pages = {480A-480A},
peerreviewed = {unknown},
publisher = {CELL PRESS},
title = {{Modifying} {Zinc} {Fingers}: {Targeting} the {Inflammatory} {Zinc} {Finger} {Protein}, {Tristetraprolin}, with {Exogenous} {Gold} {Complexes} and {Determining} a {Role} for {H2S} in {Modifying} {Trisetrapolin} {Endogenously}},
venue = {Baltimore, MD},
year = {2019}
}
@article{faucris.121246224,
abstract = {Hippocampal structural changes associated with diabetes-related cognitive impairments are well described, but their molecular background remained vague. We examined whether/how diabetes alters molecular basis of energy metabolism in hippocampus readily after diabetes onset, with special emphasis on its redox-sensitivity.To induce diabetes, adult Mill Hill hybrid hooded rats received a single alloxan dose (120mg/kg). Both non-diabetic and diabetic groups were further divided in two subgroups receiving (i) or not (ii) superoxide dismutase (SOD) mimic, [Mn(II)(pyane)Cl] for 7 days, i.p. Treatment of the diabetic animals started after blood glucose level ≥12mM.Diabetes decreased protein levels of oxidative phosphorylation components: complex III and ATP synthase. In contrast, protein amounts of glyceraldehyde-3-phosphate dehydrogenase, pyruvate dehydrogenase, and hypoxia-inducible factor-1α - the key regulator of energy metabolism in stress conditions, were higher in diabetic animals. Treatment with SOD mimic restored/increased the levels of oxidative phosphorylation components and returned hypoxia-inducible factor-1α to control level, while diabetes-induced up-regulation of glycolytic enzyme, glyceraldehyde-3-phosphate dehydrogenase, was additionally stimulated.To conclude, our results provide insight into the earliest molecular changes of energy-producing pathways in diabetes that may account for structural/functional disturbance of hippocampus, seen during disease progression. Also, data suggest [Mn(II)(pyane)Cl] as potential therapeutic agent in cutting-edge approaches to threat this widespread metabolic disorder. © 2013 Elsevier Inc.},
author = {Stancic, Ana and Otasevic, Vesna and Jankovic, Aleksandra and Vucetic, Milica and Ivanovic-Burmazovic, Ivana and Filipovic, Milos and Korac, Aleksandra and Markelic, Milica and Velickovic, Ksenija and Golic, Igor and Buzadzic, Biljana and Korac, Bato},
doi = {10.1016/j.brainresbull.2013.09.009},
faupublication = {yes},
journal = {Brain Research Bulletin},
pages = {27-33},
peerreviewed = {Yes},
title = {{Molecular} basis of hippocampal energy metabolism in diabetic rats: {The} effects of {SOD} mimic},
volume = {99},
year = {2013}
}
@article{faucris.120217944,
author = {Ivanovic-Burmazovic, Ivana},
doi = {10.1515/BIRM.2011.004},
faupublication = {yes},
journal = {Inorganic Reaction Mechanisms},
pages = {3-4},
peerreviewed = {Yes},
title = {{New} era of reaction mechanisms in inorganic and bioinorganic chemistry},
volume = {7},
year = {2011}
}
@article{faucris.107436384,
abstract = {The octahedral Ni(II) complex with dioxo-2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)diacetic acid (Hdapoamh) was synthesized and X-ray analysis confirmed the tridentate coordination for the neutral ligand. Besides, the square planar Ni(II) complex with dianion 2′, 2‴-(2,6-pyridinediyldiethylidyne)dioxamohydrazide (Hdapsox) was synthesized and characterized. © 2001 Elsevier Science B.V.},
author = {Pelizzi, Giancarlo and Bacchi, Alessia and Ivanovic-Burmazovic, Ivana and Gruden, M. and Andjelkovic, K.},
doi = {10.1016/S1387-7003(01)00161-7},
faupublication = {no},
journal = {Inorganic Chemistry Communications},
pages = {311-314},
peerreviewed = {Yes},
title = {{Ni}({II}) complexes with neutral and dianionic form of 2,6-diacetylpyridine bis(acylhydrazones). {Crystal} structure of bis[dioxo-2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene) diacetic acid]nickel({II}) perchlorate},
volume = {4},
year = {2001}
}
@article{faucris.120806884,
abstract = {The role of NO in biology is well established. However, an increasing body of evidence suggests that azanone (HNO), could also be involved in biological processes, some of which are attributed to NO. In this context, one of the most important and yet unanswered questions is whether and how HNO is produced in vivo. A possible route concerns the chemical or enzymatic reduction of NO. In the present work, we have taken advantage of a selective HNO sensing method, to show that NO is reduced to HNO by biologically relevant alcohols with moderate reducing capacity, such as ascorbate or tyrosine. The proposed mechanism involves a nucleophilic attack to NO by the alcohol, coupled to a proton transfer (PCNA: proton-coupled nucleophilic attack) and a subsequent decomposition of the so-produced radical to yield HNO and an alkoxyl radical. (Graph Presented).},
author = {Suarez, Sebastian A. and Neuman, Nicolas I. and Munoz, Martina and Alvarez, Lucia and Bikiel, Damian and Brondino, Carlos D. and Ivanovic-Burmazovic, Ivana and Miljkovic, Jan and Filipovic, Milos and Marti, Marcelo A. and Doctorovich, Fabio},
doi = {10.1021/ja512343w},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {4720-4727},
peerreviewed = {Yes},
title = {{Nitric} {Oxide} {Is} {Reduced} to {HNO} by {Proton}-{Coupled} {Nucleophilic} {Attack} by {Ascorbate}, {Tyrosine}, and {Other} {Alcohols}. {A} {New} {Route} to {HNO} in {Biological} {Media}?},
volume = {137},
year = {2015}
}
@article{faucris.117878244,
abstract = {(Chemical Equation Presented) While nitric oxide (NO, nitrogen monoxide) is a critically important signaling agent, its cellular concentrations must be tightly controlled, generally through its oxidative conversion to nitrite (NO2-) where it is held in reserve to be reconverted as needed. In part, this reaction is mediated by the binuclear heme a3/CuB active site of cytochrome c oxidase. In this report, the oxidation of NO(g) to nitrite is shown to occur efficiently in new synthetic μ-oxo heme-FeIII-O-CuII(L) constructs (L being a tridentate or tetradentate pyridyl/alkylamino ligand), and spectroscopic and kinetic investigations provide detailed mechanistic insights. Two new X-ray structures of μ-oxo complexes have been determined and compared to literature analogs. All μ-oxo complexes react with 2 mol equiv NO(g) to give 1:1 mixtures of discrete [(L)CuII(NO2-)]+ plus ferrous heme-nitrosyl compounds; when the first NO(g) equiv reduces the heme center and itself is oxidized to nitrite, the second equiv of NO(g) traps the ferrous heme thus formed. For one μ-oxo heme-FeIII-O-CuII(L) compound, the reaction with NO(g) reveals an intermediate species ("intermediate"), formally a bis-NO adduct, [(NO)(porphyrinate)FeII-(NO2-)-CuII(L)]+ (λmax = 433 nm), confirmed by cryo-spray ionization mass spectrometry and EPR spectroscopy, along with the observation that cooling a 1:1 mixture of [(L)CuII(NO2-)]+ and heme-FeII(NO) to -125°C leads to association and generation of the key 433 nm UV-vis feature. Kinetic-thermodynamic parameters obtained from low-temperature stopped-flow measurements are in excellent agreement with DFT calculations carried out which describe the sequential addition of NO(g) to the μ-oxo complex.},
author = {Hematian, Shabnam and Kenkel, Isabell and Shubina, Tatyana and Dürr, Maximilian and Liu, Jeffrey J. and Siegler, Maxime A. and Ivanovic-Burmazovic, Ivana and Karlin, Kenneth D.},
doi = {10.1021/jacs.5b02174},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {6602-6615},
peerreviewed = {Yes},
title = {{Nitrogen} {Oxide} {Atom}-{Transfer} {Redox} {Chemistry}; {Mechanism} of {NO}(g) to {Nitrite} {Conversion} {Utilizing} μ-oxo {Heme}-{Fe}
{III}-{O}-{Cu}
{II}({L}) {Constructs}},
volume = {137},
year = {2015}
}
@article{faucris.201111908,
author = {Ivanovic-Burmazovic, Ivana and Wedmann, Rudolf and Filipovic, Milos},
doi = {10.1098/rsfs.2016.0139},
faupublication = {yes},
journal = {Interface Focus},
keywords = {Nitric oxide; Hydrogen sulfide; Thionitrous acid; Nitrosopersulfide},
peerreviewed = {Yes},
title = {{Nitrosopersulfide} ({SSNO}−) decomposes in the presence of sulfide, cyanide or glutathione to give {HSNO}/{SNO}−: {Consequences} for the assumed role in cell signalling},
volume = {7},
year = {2017}
}
@article{faucris.120218384,
abstract = {Redox selectivity? Seven-coordinate manganese(II) pentaazamacrocyclic complexes stimulate NO disproportionation by a novel dismutation mechanism based on the formation of labile metal-nitrosyl adducts and which is associated with the Mn/Mn redox cycle. The metal-bound NO in these aducts has the character and reactivity of NO and NO species. Ex vivo studies suggest that superoxide dismutase mimics of this kind could interfere with NO-mediated processes in biological milieu. (Chemical Equation Presented) © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.},
author = {Filipovic, Milos and Dürr, Katharina L. and Mojovic, Milos and Simeunovic, Vladica and Zimmermann, Robert and Nicetic, Vesna and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/anie.200801325},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {8735-8739},
peerreviewed = {Yes},
title = {{NO} dismutase activity of seven-coordinate manganese({II}) pentaazamacrocyclic complexes},
volume = {47},
year = {2008}
}
@article{faucris.201112264,
author = {Hannigan, Steven F. and Arnoff, Amanda I. and Neville, Sarah E. and Lum, June S. and Golen, James A. and Rheingold, Arnold L. and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Liebhaeuser, Patricia and Roesener, Thomas and Stanek, Julia and Hoffmann, Alexander and Herres-Pawlis, Sonja and Doerrer, Linda H.},
doi = {10.1002/chem.201605926},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {kinetics; reaction mechanisms; copper; dioxygen; stopped-flow spectroscopy},
pages = {8212-8224},
peerreviewed = {Yes},
title = {{On} the {Way} to a {Trisanionic} {Cu3O2} {Core} for {Oxidase} {Catalysis}: {Evidence} of an {Asymmetric} {Trinuclear} {Precursor} {Stabilized} by {Perfluoropinacolate} {Ligands}},
volume = {23},
year = {2017}
}
@article{faucris.121246884,
abstract = {We report a general fragmentation-and-re-assembly route which gives access to high-nuclearity, mixed-metal polyoxometalate clusters. Reduced vanadium(iv) precursors are oxidatively dis-assembled into reactive fragments which subsequently re-aggregate under template control in a one-pot reaction. It is shown that the oxidative dis-assembly is required, as the use of vanadium(v)-based precursors results in the formation of smaller clusters. The principle is exemplified by the synthesis of a ca. 1.8 × 1.7 × 1.0 nm, 36-nuclear copper vanadium oxide cluster, (nBu N)[CuVO(NO )(CHCN)]. The cluster is characterized in the solid-state and in solution by single-crystal XRD, ESI-MS and other spectroscopic and electrochemical measurements. Several lines of evidence show that the compound is indeed formed exclusively by fully oxidized vanadium(v) centres. In addition, primary fragmentation products of the type [VO(dmso)] were isolated. The cuprovanadate cluster features pentagonal secondary building units of the type {(V)M} (M = Cu, V) which show similar structural function as the well-known {(Mo)Mo } pentagons observed in giant molybdate clusters. The observation suggests that more complex vanadate clusters might be accessible based on these pentagonal units. © 2013 The Royal Society of Chemistry.},
author = {Forster, Johannes and Rösner, Benedikt and Fink, Rainer and Nye, Leanne and Ivanovic-Burmazovic, Ivana and Kastner, Katharina and Tucher, Johannes and Streb, Carsten},
doi = {10.1039/c2sc20942j},
faupublication = {yes},
journal = {Chemical Science},
pages = {418-424},
peerreviewed = {Yes},
title = {{Oxidation}-driven self-assembly gives access to high-nuclearity molecular copper vanadium oxide clusters},
volume = {4},
year = {2013}
}
@article{faucris.120220804,
abstract = {This paper reports the first Co(II) complexes with a singly- and doubly-deprotonated HL ligand (HL = 2′,2‴-(2,6-pyridindiyldiethylidene)dioxamohydrazide belonging to the planar pentadentate class. The complexes were characterized by elemental analysis, thermal analysis, IR spectroscopy, molar conductivity and magnetic susceptibility measurements. The crystal structure of [Co(L)(HO)]-6HO complex has been determined. The pentagonal bipyramidal geometry present in the previously synthesized complex [Co(HL)(HO)(MeOH)](ClO), wherein the ligand is present in a neutral form, has been preserved around Co(II).},
author = {Ivanovic-Burmazovic, Ivana and Andjelkovic, K. and Beljanski, V. and Prelesnik, Bogdan and Leovac, V. and Momirovic, Mirijana},
faupublication = {no},
journal = {Journal of Coordination Chemistry},
pages = {335-342},
peerreviewed = {Yes},
title = {{Pentagonal} bipyramidal complexes of {Co}({II}) with singly- and doubly-deprotonated 2′,2â´-(2,6-pyridindiyldi-ethylidene)dioxamohydrazide: {The} {Crystal} {Structure} of [{Diaqua}-2′,2â´-(2,6-{Pyridindiyldiethylidene}) {Dioxamohydrazidecobalt}({II})] {Hexahydrate}},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0000645129&origin=inward},
volume = {42},
year = {1997}
}
@article{faucris.121247104,
abstract = {[Mn(Hdapsox) Cl(HO)]Cl·HO (1) and [Zn(Hdapsox)- (HO)]Cl·HO (2) were synthesized from 2,6-diacetylpyridine (dap), oxamic acid hydrazide (sox) and MnCl·4HO or ZnCl·2HO in 1:2:1 molar ratio, employing a template approach. Based on elemental analyses, molar conductivity and magnetic susceptibility data, IR, H and C NMR and EA spectra, as well as thermal analyses (DSC and TG), a pentagonal-bipyramidal (PBP) geometry for the complexes was determined. Symmetrically coordinated 2′,2‴-(2,6-pyridindiyldiethylidene)dioxamohydrazide (Hdapsox) is located as a pentadentate ligand in the equatorial plane. The stability of the 3d metal complexes having the PBP geometry is discussed. It was found that Co(II) and Mn(II) produce the most stable complexes of this type, while the Zn(II) complex of the same geometry is much less stable.},
author = {Sumar, Maja and Ivanovic-Burmazovic, Ivana and Hodzic, Ismet and Andjelkovic, K.},
doi = {10.1081/SIM-120004442},
faupublication = {no},
journal = {Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry},
pages = {721-737},
peerreviewed = {Yes},
title = {{Pentagonal}-bipyramidal {Mn}({II}) and {Zn}({II}) complexes with 2′,2â´(2,6-pyridindiyldiethylidene)dioxamohydrazide},
volume = {32},
year = {2002}
}
@article{faucris.111044604,
abstract = {In this contribution, we report a detailed investigation of a photocatalytic system capable of producing hydrogen under aerobic conditions. This system consists of [Ru(dnbpy)(tbbpy)]-(PF) (1; dnbpy=4,4′-dinitrile-2,2′-bipyridine; tbbpy=4,4′-ditert-butyl-2,2′-bipyridine) as the chromophore, [Co(dmgH)] (dmgH=dimethylglyoximato) as the reduction catalyst, and triethylamine (TEA) as the electron donor. Most surprisingly, the system shows a higher catalytic activity under aerobic than under inert conditions. Detailed investigations of the catalytic process reveal that the nitrile groups probably convert to amides upon addition of TEA, and further intermediates are formed during the catalytic process. For further investigation of the surprising photocatalytic behavior of compound 1 in air, UV/Vis spectroscopic studies and time-dependent measurements of the oxygen concentration during the photocatalytic process, both in the headspace and the liquid phase, are performed.},
author = {Staehle, Robert and Losse, Sebastian and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and Vos, Johannes G. and Rau, Sven},
doi = {10.1002/cplu.201402174},
faupublication = {yes},
journal = {ChemPlusChem},
keywords = {Cobalt; Oxygen; Photocatalysis; Ruthenium polypyridyl; Water splitting},
pages = {1614-1621},
peerreviewed = {unknown},
title = {{Photocatalytic} generation of hydrogen from water under aerobic conditions},
volume = {79},
year = {2014}
}
@article{faucris.117873844,
abstract = {The nonheme iron complex, [Fe(NO)(N3PyS)]BF4, is a rare example of an {FeNO}(7) species that exhibits spin-crossover behavior. The comparison of X-ray crystallographic studies at low and high temperatures and variable-temperature magnetic susceptibility measurements show that a low-spin S = 1/2 ground state is populated at 0-150 K, while both low-spin S = 1/2 and high-spin S = 3/2 states are populated at T > 150 K. These results explain the observation of two N-O vibrational modes at 1737 and 1649 cm(-1) in CD3CN for [Fe(NO)(N3PyS)]BF4 at room temperature. This {FeNO}(7) complex reacts with dioxygen upon photoirradiation with visible light in acetonitrile to generate a thiolate-ligated, nonheme iron(III)-nitro complex, [Fe(III)(NO2)(N3PyS)](+), which was characterized by EPR, FTIR, UV-vis, and CSI-MS. Isotope labeling studies, coupled with FTIR and CSI-MS, show that one O atom from O2 is incorporated in the Fe(III)-NO2 product. The O2 reactivity of [Fe(NO)(N3PyS)]BF4 in methanol is dramatically different from CH3CN, leading exclusively to sulfur-based oxidation, as opposed to NO· oxidation. A mechanism is proposed for the NO· oxidation reaction that involves formation of both Fe(III)-superoxo and Fe(III)-peroxynitrite intermediates and takes into account the experimental observations. The stability of the Fe(III)-nitrite complex is limited, and decay of [Fe(III)(NO2)(N3PyS)](+) leads to {FeNO}(7) species and sulfur oxygenated products. This work demonstrates that a single mononuclear, thiolate-ligated nonheme {FeNO}(7) complex can exhibit reactivity related to both nitric oxide dioxygenase (NOD) and nitrite reductase (NiR) activity. The presence of the thiolate donor is critical to both pathways, and mechanistic insights into these biologically relevant processes are presented.},
author = {Mc Quilken, Alison C. and Matsumura, Hirotoshi and Dürr, Maximilian and Confer, Alex M. and Sheckelton, John P. and Siegler, Maxime A. and Mc Queen, Tyrel M. and Ivanovic-Burmazovic, Ivana and Moenne-Loccoz, Pierre and Goldberg, David P.},
doi = {10.1021/jacs.5b12741},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {3107-17},
peerreviewed = {Yes},
title = {{Photoinitiated} {Reactivity} of a {Thiolate}-{Ligated}, {Spin}-{Crossover} {Nonheme} {FeNO}(7) {Complex} with {Dioxygen}.},
volume = {138},
year = {2016}
}
@article{faucris.225326791,
abstract = {Recently, comprehensive studies on positively charged manganese porphyrins show that these compounds, known for their superoxide dismutase (SOD) mimetic ability, can be equally reactive toward a broad array of other redox active molecules of biological relevance present in a cellular milieu. In this context, the examination of some fundamental aspects of physicochemical behavior of metalloporphyrins behind their rich aqueous chemistry is believed to provide a valuable basis for the understanding of newly observed biological effects of these compounds in vivo and throw more light on a potential use of common SOD porphyrin mimetics for other redox active cellular targets in order to earn desirable therapeutic effects. Herein, we present versatile characteristics of highly positively charged Mn(P) and Fe(P) porphyrins (with up to +9 and +8 overall charge, respectively) with regard to their acid-base equilibria, metal coordination sphere, water-exchange dynamics, redox properties, and substitution behavior toward selected ligands. For the purpose of these comparative studies, we synthesized for the first time a 9-fold cationic manganese(III) porphyrin. The findings reported in this study enabled highlighting the most important similarities and differences characterizing the aqueous chemistry of positively charged manganese and iron porphyrins and, therefore, outlining the potential factors which can affect the intimate underlying mechanism behind the redox cycling of these metalloporphyrins.},
author = {Franke, Alicja and Scheitler, Andreas and Kenkel, Isabell and Lippert, Rainer and Zahl, Achim and Balbinot, Domenico and Jux, Norbert and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/acs.inorgchem.8b03381},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {CRIS-Team Scopus Importer:2019-08-30},
pages = {9618-9630},
peerreviewed = {No},
title = {{Positive} {Charge} on {Porphyrin} {Ligand} and {Nature} of {Metal} {Center} {Define} {Basic} {Physicochemical} {Properties} of {Cationic} {Manganese} and {Iron} {Porphyrins} in {Aqueous} {Solution}},
volume = {58},
year = {2019}
}
@book{faucris.121224444,
author = {van Eldik, Rudi and Ivanovic-Burmazovic, Ivana},
doi = {10.1016/B978-0-12-396462-5.00009-X},
faupublication = {yes},
pages = {-},
peerreviewed = {Yes},
publisher = {Academic Press, Inc.},
title = {{Preface}},
volume = {64},
year = {2012}
}
@article{faucris.121255904,
abstract = {Three condensation products of usnic acid with the hydrazides of α-naphthoic, caprylic, and oxamic acids, respectively, have been prepared and characterized by spectrometric methods. A reassignment of the C-NMR spectral data of usnic acid has been done. The crystal structure of usnic acid 11-[(1-naphthoyl)hydrazone] ethanol solvate (1:1) has been determined. This substance crystallizes in the monoclinic crystal system, the space group P2 , with the unit cell dimensiones a = 7.7365(7) Å, b = 19.632(2) Å, c = 9.4150(15) Å, β = 108.830(11)° V = 1405.0(4) Å , and Z = 2. At the end of the structure analysis R = 0.055, R = 0.052 and S = 0.89. The antibacterial activities of the compounds have been evaluated. The greatest activity against Staphylococcus aureus was found for usnic acid, somewhat lower for the derivatives with hydrazides of α-naphthoic and caprylic acid, and much lower for the derivative with semioxamazide. The activities of these compounds probably depend on their lipophilicity.},
author = {Sladic, D. and Beljanski, V. and Prelesnik, Bogdan and Ivanovic-Burmazovic, Ivana and Andjelkovic, K. and et al.},
author_hint = {Sladić D., Beljanski V., Prelesnik B., Bogdanović G., Ivanović I., Andjelković K.},
faupublication = {no},
journal = {Journal of the Serbian Chemical Society},
pages = {171-182},
peerreviewed = {Yes},
support_note = {Author relations incomplete. You may find additional data in field 'author{\_}hint'},
title = {{Preparation}, crystal structure and antibacterial activity of condensation products of usnic acid and acyl hydrazides},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0032331613&origin=inward},
volume = {63},
year = {1998}
}
@article{faucris.109991024,
abstract = {The redox reaction of superoxide (KO2) with highly charged iron porphyrins (Fe(P4+), Fe(P8+), and Fe(P8-)) has been investigated in the ionic liquids (IL) [EMIM] [Tf2N] (1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide) and [EMIM] [B(CN)(4)] (1-ethyl-3-methylimidazolium tetracyanoborate) by using time-resolved UV/vis stopped-flow, electrochemistry, cryospray mass spectrometry, EPR, and XPS measurements. Stable KO2 solutions in [EMIM] [Tf2N] can be prepared up to a IS mM concentration and are characterized by a signal in EPR spectrum at g = 2.0039 and by the 1215 cm(-1) stretching vibration in the resonance Raman spectrum While the negatively charged iron porphyrin Fe(P8-) does not react with superoxide in IL, Fe(P4+) and Fe(P8+) do react in a two-step process (first a reduction of the Fe(III) to the Fe(II) form, followed by the binding of superoxide to Fe(II)). In the reaction with KO2, Fe(P4+) and Fe(P8+) show similar rate constants (e.g., in the case of Fe(P4+): k(1) = 18.6 +/- 0.5 M-1 s(-1) for the first reaction step, and k(2) = 2.8 +/- 0.1 M-1 s(-1) for the second reaction step). Notably, these rate constants are four to five orders of magnitude lower in [EMIM] [Tf2N] than in conventional solvents such as DMSO. The influence of the ionic liquid is also apparent during electrochemical experiments, where the redox potentials for the corresponding Fe(III)/Fe(II) couples are much more negative in [EMIM] [Tf2N] than in DMSO. This modified redox and kinetic behavior of the positively charged iron porphyrins results from their interactions with the anions of the ionic liquid, while the nucleophilicity of the superoxide is reduced by its interactions with the cations of the ionic liquid. A negligible vapor pressure of [EMIM][B(CN)(4)] and a sufficient enrichment of Fe(P8+) in a close proximity to the surface enabled XPS measurements as a case study for monitoring direct changes in the electronic structure of the metal centers during redox processes in solution and at liquid/solid interfaces.},
author = {Dees, Anne and Jux, Norbert and Tröppner, Oliver and Dürr, Katharina L. and Lippert, Rainer and Schmid, Martin and Kuestner, Bernd and Schluecker, Sebastian and Steinrück, Hans-Peter and Gottfried, J. Michael and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/acs.inorgchem.5b00770},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {6862-6872},
peerreviewed = {Yes},
title = {{Reactions} of {Superoxide} with {Iron} {Porphyrins} in the {Bulk} and the {Near}-{Surface} {Region} of {Ionic} {Liquids}},
volume = {54},
year = {2015}
}
@book{faucris.111899524,
abstract = {The (bio)chemistry and physiology of superoxide and nitric oxide and their interactions with metal centers are very complex issues, which require a multidisciplinary approach. We are still not fully aware of the reactions that occur in relatively simple . in vitro conditions and we know even less about the real processes on a molecular level under the . in vivo conditions. Systematic studies and reliable, comparable data on number of different manganese superoxide dismutase (MnSOD) mimetics, regarding their reactivity toward reactive oxygen and nitrogen species and corresponding reaction mechanisms, are required for the further progress in the field and possible biomedical application of the gained knowledge. We present here some important aspects of chemistry, in particular, redox activity, and biochemistry of superoxide and nitric oxide as well as their interaction with MnSOD mimetics that should be considered for the future design and pharmacological studies of manganese-based therapeutics and even diagnostic tools. © 2012 Elsevier Inc.},
author = {Ivanovic-Burmazovic, Ivana and Filipovic, Milos},
doi = {10.1016/B978-0-12-396462-5.00003-9},
faupublication = {yes},
pages = {53-95},
peerreviewed = {Yes},
publisher = {Academic Press, Inc.},
title = {{Reactivity} of manganese superoxide dismutase mimics toward superoxide and nitric oxide. {Selectivity} versus cross-reactivity.},
volume = {64},
year = {2012}
}
@article{faucris.201112591,
author = {Liebhaeuser, Patricia and Keisers, Kristina and Hoffmann, Alexander and Schnappinger, Thomas and Sommer, Isabella and Thoma, Anne and Wilfer, Claudia and Schoch, Roland and Stuehrenberg, Kai and Bauer, Matthias and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Herres-Pawlis, Sonja},
doi = {10.1002/chem.201700887},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {copper; N-donor ligands; tyrosinase model; density functional calculations; hydroxylation},
pages = {12171-12183},
peerreviewed = {Yes},
title = {{Record} {Broken}: {A} {Copper} {Peroxide} {Complex} with {Enhanced} {Stability} and {Faster} {Hydroxylation} {Catalysis}},
volume = {23},
year = {2017}
}
@article{faucris.117874724,
abstract = {Metallamacrocylic tetraruthenium complexes were generated by treatment of 1,4-divinylphenylene-bridged diruthenium complexes with functionalized 1,3-benzene dicarboxylic acids and characterized by HR ESI-MS and multinuclear NMR spectroscopy. Every divinylphenylene diruthenium subunit is oxidized in two consecutive one-electron steps with half-wave potential splittings in the range of 250 to 330 mV. Additional, smaller redox-splittings between the +/2+ and 0/+ and the 3+/4+ and 2+/3+ redox processes, corresponding to the first and the second oxidations of every divinylphenylene diruthenium entity, are due to electrostatic effects. The lack of electronic coupling through bond or through space is explained by the nodal properties of the relevant molecular orbitals and the lateral side-by-side arrangement of the divinylphenylene linkers. The polyelectrochromic behavior of the divinylphenylene diruthenium precursors is retained and even amplified in these metallamacrocyclic structures. EPR studies down to T=4 K indicate that the dications 1-H(2+) and 1-OBu(2+) are paramagnetic. The dications and the tetracation of macrocycle 3-H display intense (dications) or weak (3-H(4+) ) EPR signals. Quantum chemical calculations indicate that the four most stable conformers of the macrocycles are largely devoid of strain. Bond parameters, energies as well as charge and spin density distributions of model macrocycle 5-H(Me) were calculated for the different charge and spin states.},
author = {Scheerer, Stefan and Linseis, Michael and Wuttke, Evelyn and Weickert, Sabrina and Drescher, Malte and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Irmler, Andreas and Pauly, Fabian and Winter, Rainer F},
doi = {10.1002/chem.201601384},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {9574-90},
peerreviewed = {unknown},
title = {{Redox}-{Active} {Tetraruthenium} {Macrocycles} {Built} from 1,4-{Divinylphenylene}-{Bridged} {Diruthenium} {Complexes}.},
volume = {22},
year = {2016}
}
@article{faucris.107015964,
abstract = {EPR, optical, electrochemical and stopped-flow methods were used to demonstrate that Fe(NO) fragments in paramagnetic mononuclear and diamagnetic binuclear forms of dinitrosyl iron complexes with glutathione are reversibly reduced by a two-electron mechanism to be further transformed from the initial state with d configuration into states with the d and d electronic configurations of the iron atom. Under these conditions, both forms of DNIC display identical optical and EPR characteristics in state d suggesting that reduction of the binuclear form of DNIC initiates their reversible decomposition into two mononuclear dinitrosyl iron fragments, one of which is EPR-silent (d ) and the other one is EPR-active (d). Both forms of DNIC produce EPR signals with the following values of the g-factor: g = 2.01, g = 1.97, g = 2.0. M-DNIC with glutathione manifest an ability to pass into state d, however, only in solutions with a low content of free glutathione. Similar transitions were established for protein-bound M- and B-DNIC with thiol-containing ligands. © 2014 Elsevier Ltd. All rights reserved.},
author = {Borodulin, Rostislav R. and Dereven’kov, Ilia A. and Burbaev, Dosymzhan Sh. and Makarov, Sergei V. and Mikoyan, Vasak D. and Serezhenkov, Vladimir А. and Kubrina, Lyudmila N and Ivanovic-Burmazovic, Ivana and Vanin, Anatoly F.},
doi = {10.1016/j.niox.2014.06.005},
faupublication = {yes},
journal = {Nitric Oxide - Biology and Chemistry},
keywords = {Cyclic voltammetry; Dinitrosyl iron complexes; Redox conversions},
pages = {100-109},
peerreviewed = {unknown},
title = {{Redox} activities of mono- and binuclear forms of low-molecular and protein-bound dinitrosyl iron complexes with thiol-containing ligands},
volume = {40},
year = {2014}
}
@article{faucris.201112895,
author = {Lippert, Rainer and Shubina, Tatyana and Vojnovic, Sandra and Pavic, Aleksandar and Veselinovic, Jovana and Nikodinovic-Runic, Jasmina and Stankovic, Nada and Ivanovic-Burmazovic, Ivana},
doi = {10.1016/j.jinorgbio.2017.03.002},
faupublication = {yes},
journal = {Journal of Inorganic Biochemistry},
keywords = {Antimicrobial; Cytotoxicity; Redox properties; Ferrocene; Porphyrin},
pages = {76-89},
peerreviewed = {Yes},
title = {{Redox} behavior and biological properties of ferrocene bearing porphyrins},
volume = {171},
year = {2017}
}
@article{faucris.201113196,
author = {Dürr, Maximilian and Klein, Johannes and Kahnt, Axel and Becker, Sabine and Puchta, Ralph and Sarkar, Biprajit and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/acs.inorgchem.7b02192},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {14912-14925},
peerreviewed = {Yes},
title = {{Redox} {Behavior} of a {Dinuclear} {Ruthenium}({II}) {Complex} {Bearing} an {Uncommon} {Bridging} {Ligand}: {Insights} from {High}-{Pressure} {Electrochemistry}},
volume = {56},
year = {2017}
}
@article{faucris.238590666,
abstract = {Polyoxometalates are key materials for energy conversion and storage due to their unique chemical tunability and electrochemical reactivity. Herein, we report that functionalization of molecular vanadium oxides, polyoxovanadates, with redox-inert Ca2+cations leads to a significant increase in their electron storage capabilities. The electrochemical performance of the Ca2+-functionalized dodecavanadate [Ca2V12O32Cl(DMF)3]2−(={Ca2V12}) was thus compared with that of the precursor compound (H2NMe2)2[V12O32Cl]3−(={V12}).{Ca2V12}can store up to five electrons per cluster, while{V12}only shows one reversible redox transition. In initial studies, we demonstrated that{Ca2V12}can be used as an active material in lithium-ion cathodes. Our results show how redox-inert cations can be used as structural and electrostatic stabilizers, leading to major changes in the redox-chemistry of polyoxovanadates.},
author = {Greiner, Simon and Schwarz, Benjamin and Ringenberg, Mark and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Fichtner, Maximilian and Anjass, Montaha and Streb, Carsten},
doi = {10.1039/d0sc01401j},
faupublication = {yes},
journal = {Chemical Science},
note = {CRIS-Team Scopus Importer:2020-05-22},
pages = {4450-4455},
peerreviewed = {Yes},
title = {{Redox}-inactive ions control the redox-activity of molecular vanadium oxides},
volume = {11},
year = {2020}
}
@article{faucris.245882613,
abstract = {We present the coordination-driven self-assembly of three tetranuclear metallacycles containing intracyclic NH2, OH, or OMe functionalities through the combination of various isophthalic acid building blocks with a divinylphenylene diruthenium complex. All new complexes of this study were characterized by means of nuclear magnetic resonance spectroscopy, ultrahigh-resolution ESI mass spectrometry, cyclic and square wave voltammetry and, in two cases, X-ray diffraction. The hydroxy functionalized macrocycle 4-BOH and the corresponding half-cycle 2-OH stand out, as their intracyclic OH···O hydrogen bonds stabilize their mixed-valent one- (2-OH, 4-BOH) and three-electron-oxidized states (4-BOH). Despite sizable redox splittings between all one-electron waves, the mixed-valent monocations and trications do not exhibit any intervalence charge-transfer band, assignable to through-bond electronic coupling, but nevertheless display distinct IR band shifts of their charge-sensitive Ru(CO) tags. We ascribe these seemingly contradicting observations to a redox-induced shuffling of the OH···O hydrogen bond(s) to the remaining, more electron-rich, reduced redox site.},
author = {Fink, Daniel and Staiger, Anne and Orth, Nicole and Linseis, Michael and Ivanovic-Burmazovic, Ivana and Winter, Rainer F.},
doi = {10.1021/acs.inorgchem.0c02695},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {CRIS-Team Scopus Importer:2020-11-27},
pages = {16703-16715},
peerreviewed = {Yes},
title = {{Redox}-{Induced} {Hydrogen} {Bond} {Reorientation} {Mimicking} {Electronic} {Coupling} in {Mixed}-{Valent} {Diruthenium} and {Macrocyclic} {Tetraruthenium} {Complexes}},
volume = {59},
year = {2020}
}
@article{faucris.120403404,
abstract = {Significance: In the cells' nuclei, high-mobility group box protein 1 (HMGB1) is a nonhistone chromatin-binding protein involved in the regulation of transcription. Extracellularly, HMGB1 acts as a danger molecule with properties of a proinflammatory cytokine. It can be actively secreted from myeloid cells or passively leak from any type of injured, necrotic cell. Increased serum levels of active HMGB1 are often found in pathogenic inflammatory conditions and correlate with worse prognoses in cancer, sepsis, and autoimmunity. By damaging cells, superoxide and peroxynitrite promote leakage of HMGB1. Recent Advances: The activity of HMGB1 strongly depends on its redox state: Inflammatory-active HMGB1 requires an intramolecular disulfide bond (Cys23 and Cys45) and a reduced Cys106. Oxidation of the latter blocks its stimulatory activity and promotes immune tolerance. Critical Issues: Reactive oxygen and nitrogen species create an oxidative environment and can be detoxified by superoxide dismutase (SOD), catalase, and peroxidases. Modifications of the oxidative environment influence HMGB1 activity. Future Directions: In this review, we hypothesize that manipulations of an oxidative environment by SOD mimics or by hydrogen sulfide are prone to decrease tissue damage. Both the concomitant decreased HMGB1 release and its redox chemical modifications ameliorate inflammation and tissue damage. Antioxid. Redox Signal. 20, 1075-1085. © Mary Ann Liebert, Inc.},
author = {Janko, Christina and Filipovic, Milos and Munoz Becerra, Luis and Schorn, Christine and Schett, Georg and Ivanovic-Burmazovic, Ivana and Herrmann, Martin},
doi = {10.1089/ars.2013.5179},
faupublication = {yes},
journal = {Antioxidants & Redox Signaling},
pages = {1075-1085},
peerreviewed = {Yes},
title = {{Redox} modulation of {HMGB1}-related signaling},
volume = {20},
year = {2014}
}
@article{faucris.201113537,
author = {Dereven'Kov, Ilia A. and Hannibal, Luciana and Dürr, Maximilian and Salnikov, Denis S. and Thu Thuy Bui Thi, and Makarov, Sergei V. and Koifman, Oscar I. and Ivanovic-Burmazovic, Ivana},
doi = {10.1016/j.jorganchem.2017.01.002},
faupublication = {yes},
journal = {Journal of Organometallic Chemistry},
keywords = {Vitamin C; Cobalamin; Dehydroascorbic acid; Ascorbic acid; Thiocyanate; Vitamin B12; Glutathione; Reaction mechanisms},
pages = {53-59},
peerreviewed = {Yes},
title = {{Redox} turnover of organometallic {B12} cofactors recycles vitamin {C}: {Sulfur} assisted reduction of dehydroascorbic acid by cob({II})alamin},
volume = {839},
year = {2017}
}
@article{faucris.121247324,
abstract = {N-N cleavage of the dialkylhydrazido complex [W(dppe)(NNC H)] (B) upon treatment with acid, leading to the nitrido/imido complex and piperidine, is investigated experimentally and theoretically. In acetonitrile and at room temperature, B reacts orders of magnitude more rapidly with HNEtBPh than its Mo analogue, [Mo(dppe)-(NNCH)] (B ). A stopped-flow experiment performed for the reaction of B with HNEtBPh in propionitrile at -70°C indicates that protonation of B is completed within the dead time of the stopped-flow apparatus, leading to the primary protonated intermediate BH. Propionitrile coordination to this species proceeds with a rate constant K of 1.5 ± 0.4 s, generating intermediate RCN-BH (R = Et) that rapidly adds a further proton at N and then mediates N-N bond splitting in a slower reaction (K = 0.35 ± 0.08 s, 6 equiv of acid). K and K are found to be independent of the acid concentration. The experimentally observed reactivities of B or B with acids in nitrile solvents are reproduced by DFT calculations. In particular, geometry optimization of models of solvent-coordinated, N-protonated intermediates is found to lead spontaneously to separation into the nitrido/imido complexes and piperidine/piperidinium, corresponding to activationless heterolytic N-N bond cleavage processes. Moreover, DFT indicates a spontaneous cleavage of nonsolvated B protonated at N. In the second part of this article, a theoretical analysis of the N-N cleavage reaction in the Mo(III) triamidoamine complex [HIPTNN]Mo(N) is presented (HIPTNN = hexaisopropylterphenyltriamidoamine). To this end, DFT calculations of the MoN triamidoamine complex and its protonated and reduced derivatives are performed. Calculated structural and spectroscopic parameters are compared to available experimental data. N-N cleavage most likely proceeds by one-electron reduction of the Mo(V) hydrazidium intermediate [HIPTNN]Mo(NNH), which is predicted to have an extremely elongated N-N bond. From an electronic-structure point of view, this reaction is analogous to that of Mo/W hydrazidium complexes with diphos coligands. The general implications of these results with respect to synthetic N fixation are discussed. © 2005 American Chemical Society.},
author = {Mersmann, Klaus and Horn, Kay H. and Böres, Natascha and Lehnert, Nicolai and Studt, Felix and Paulat, Florian and Peters, Gerhard and Ivanovic-Burmazovic, Ivana and van Eldik, Rudi and Tuczek, Felix},
doi = {10.1021/ic048674o},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {3031-3045},
peerreviewed = {Yes},
title = {{Reduction} pathway of end-on terminally coordinated dinitrogen. {V}. {N}-{N} bond cleavage in {Mo}/{W} hydrazidium complexes with diphosphine coligands. {Comparison} with triamidoamine systems},
volume = {44},
year = {2005}
}
@article{faucris.289026756,
abstract = {Transition-metal-mediated reductive coupling of nitric oxide (NO(g)) to nitrous oxide (N2O(g)) has significance across the fields of industrial chemistry, biochemistry, medicine, and environmental health. Herein, we elucidate a density functional theory (DFT)-supplemented mechanism of NO(g) reductive coupling at a copper-ion center, [(tmpa)CuI(MeCN)]+ (1) {tmpa = tris(2-pyridylmethyl)amine}. At −110 °C in EtOH (<−90 °C in MeOH), exposing 1 to NO(g) leads to a new binuclear hyponitrite intermediate [{(tmpa)CuII}2(μ-N2O22-)]2+ (2), exhibiting temperature-dependent irreversible isomerization to the previously characterized κ2-O,O′-trans-[(tmpa)2Cu2II(μ-N2O22-)]2+ (OOXray) complex. Complementary stopped-flow kinetic analysis of the reaction in MeOH reveals an initial mononitrosyl species [(tmpa)Cu(NO)]+ (1-(NO)) that binds a second NO molecule, forming a dinitrosyl species [(tmpa)CuII(NO)2] (1-(NO)2). The decay of 1-(NO)2 requires an available starting complex 1 to form a dicopper-dinitrosyl species hypothesized to be [{(tmpa)Cu}2(μ-NO)2]2+ (D) bearing a diamond-core motif, en route to the formation of hyponitrite intermediate 2. In contrast, exposing 1 to NO(g) in 2-MeTHF/THF (v/v 4:1) at <−80 °C leads to the newly observed transient metastable dinitrosyl species [(tmpa)CuII(NO)2] (1-(NO)2) prior to its disproportionation-mediated transformation to the nitrite product [(tmpa)CuII(NO2)]+. Our study furnishes a near-complete profile of NO(g) activation at a reduced Cu site with tripodal tetradentate ligation in two distinctly different solvents, aided by detailed spectroscopic characterization of metastable intermediates, including resonance Raman characterization of the new dinitrosyl and hyponitrite species detected.},
author = {Bhadra, Mayukh and Albert, Therese and Franke, Alicja and Josef, Verena and Ivanovic-Burmazovic, Ivana and Swart, Marcel and Moënne-Loccoz, Pierre and Karlin, Kenneth D.},
doi = {10.1021/jacs.2c09874},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2023-02-10},
pages = {2230-2242},
peerreviewed = {Yes},
title = {{Reductive} {Coupling} of {Nitric} {Oxide} by {Cu}({I}): {Stepwise} {Formation} of {Mono}- and {Dinitrosyl} {Species} {En} {Route} to a {Cupric} {Hyponitrite} {Intermediate}},
volume = {145},
year = {2023}
}
@article{faucris.120807764,
abstract = {By design of a heme model complex with a binding pocket of appropriate size and flexibility, and by elucidating its kinetics and thermodynamics under elevated pressures, some of the pressure effects are demonstrated relevant for operation of heme-proteins under deep-sea conditions. Opposite from classical paradigms of the spin-crossover and reaction kinetics, a pressure increase can cause deceleration of the small-molecule binding to the vacant coordination site of the heme-center in a confined space and stabilize a high-spin state of its Fe center. This reverse high-pressure behavior can be achieved only if the volume changes related to the conformational transformation of the cavity can offset the volume changes caused by the substrate binding. It is speculated that based on these criteria nature could make a selection of structures of heme pockets that assist in reducing metabolic activity and enzymatic side reactions under extreme pressure conditions.},
author = {Tröppner, Oliver and Lippert, Rainer and Shubina, Tatyana and Zahl, Achim and Jux, Norbert and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/anie.201406954},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {confined space; heme proteins; high pressure; small-molecule binding; spin crossover},
pages = {11452-11457},
peerreviewed = {unknown},
title = {{Reverse} {Spin}-{Crossover} and {High}-{Pressure} {Kinetics} of the {Heme} {Iron} {Center} {Relevant} for the {Operation} of {Heme} {Proteins} under {Deep}-{Sea} {Conditions}},
volume = {53},
year = {2014}
}
@article{faucris.228446602,
abstract = {M6L412+ supramolecular cages 3a and 3b (M = Pd, Pt), soluble in organic solvents, contain two different ligand-centered redox sites that enable the reversible storage of up to 16 electrons, as probed by CV, UV/vis spectro-electrochemistry (SEC-UV/Vis), bulk electrolysis and EPR. Encapsulation of a B12F122- anion is confirmed by 1H, 19F NMR and 19F DOSY NMR spectroscopy and mass spectrometry.},
author = {Plessius, Raoul and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Siegler, Maxime A. and Reek, Joost N. H. and Van Der Vlugt, Jarl Ivar},
doi = {10.1039/c9cc07138e},
faupublication = {yes},
journal = {Chemical Communications},
note = {CRIS-Team Scopus Importer:2019-10-29},
pages = {12619-12622},
peerreviewed = {Yes},
title = {{Reversible} multi-electron storage in dual-site redox-active supramolecular cages},
volume = {55},
year = {2019}
}
@article{faucris.233242238,
abstract = {Self-assembly of a divinylthiophene-bridged diruthenium complex with 2,5-furandicarboxylate leads to the formation of two macrocyclic structures that differ solely with regard to their respective nuclearities. Both supramolecular isomers were fully characterized and the conversion of the hexa- to the tetraruthenium macrocycle was followed by NMR monitoring.},
author = {Fink, Daniel and Orth, Nicole and Linseis, Michael and Ivanovic-Burmazovic, Ivana and Winter, Rainer F.},
doi = {10.1039/c9cc09307a},
faupublication = {yes},
journal = {Chemical Communications},
note = {CRIS-Team Scopus Importer:2020-02-04},
pages = {1062-1065},
peerreviewed = {Yes},
title = {{Ring} size matters: {Supramolecular} isomerism in self-assembled redox-active tetra- {And} hexaruthenium macrocycles},
volume = {56},
year = {2020}
}
@article{faucris.121248204,
abstract = {The kinetics and mechanism of substitution reactions of novel monofunctional [Pt(tpdm)Cl] and [Pd(tpdm)Cl] complexes (where tpdm = tripyridinedimethane) and their aqua analogues with thiourea (tu), l-methionine (l-met), glutathione (GSH), and guanosine-5′-monophosphate (5′-GMP) were studied in 0.1 M NaClO at pH = 2.5 (in the presence of 10 mM NaCl for reactions of the chlorido complexes). The reactivity of the investigated nucleophiles follows the order tu > l-met > GSH > 5′-GMP. The reported rate constants showed the higher reactivity of the Pd(II) complexes as well as the higher reactivity of the aqua complex than the corresponding chlorido complex. The negative values reported for the activation entropy as well as the activation volume confirmed an associative substitution mode. In addition, the molecular and crystal structure of [Pt(tpdm)Cl]Cl was determined by X-ray crystallography. The compound crystallizes in a monoclinic space group C2/c with two independent molecules of the complex and unit cell dimensions of a = 38.303(2) Å, b = 9.2555(5) Å, c = 27.586(2) Å, β = 133.573(1)°, and V = 7058.3(8) Å . The cationic complex [Pt(tpdm)Cl] exhibits square-planar coordination around the Pt(II) center. The lability of the [Pt(tpdm)Cl] complex is orders of magnitude lower than that of [Pt(terpyridine)Cl] . Quantum chemical calculations were performed on the [Pt(tpdm)Cl] and [Pt(terpyridine)Cl] complexes and their reactions with thiourea. Theoretical computations for the corresponding Ni(II) complexes clearly demonstrated that π-back-bonding properties of the terpyridine chelate can account for acceleration of the nucleophilic substitution process as compared to the tpdm chelate, where introduction of two methylene groups prevents such an effective π-back bonding. © 2012 American Chemical Society.},
author = {Petrovic, Biljana and Bugarcic, Zivadin D. and Dees, Anne and Ivanovic-Burmazovic, Ivana and Heinemann, Frank Wilhelm and Puchta, Ralph and Steinmann, Stephan N. and Corminboeul, Clemence and van Eldik, Rudi},
doi = {10.1021/ic201807a},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {1516-1529},
peerreviewed = {Yes},
title = {{Role} of π-acceptor effects in controlling the lability of novel monofunctional {Pt}({II}) and {Pd}({II}) complexes: {Crystal} structure of [{Pt}(tripyridinedimethane){Cl}]{Cl}},
volume = {51},
year = {2012}
}
@article{faucris.216191433,
abstract = {Interactions between small inorganic molecules are fundamental to the understanding of basic reaction mechanisms and some of the initial processes of chemical evolution that preceded organic molecules and led to the origin of life. The kinetics of these processes are suitable for the fast generation of a variety of new chemical entities and the propagation of a cascade of chemical reactions, a property that is ideal for signaling purposes even in biological systems. NO and H2S are such molecules that are nowadays recognized as biological gasotransmitters involved in the regulation of physiological functions through protein modifications such as S-nitrosothiol, disulfide, and persulfide formations. In this Viewpoint, we review the current understanding of interactions of NO (and organic and metal nitrosyl species) with H2S, in both chemical and biochemical contexts. Through the formation of HNO, (H)SNO (and its isomers), (H)SSNO, and polysulfides, these two gasotransmitters initiate reaction networks with significant roles in cell signaling. The chemical reactivities and biological effects of these nitrogen and sulfur species are still unresolved, and, thus, a cross-talk between all of them represents a challenging interdisciplinary field that awaits exciting new findings. We tackle some of the intriguing and open questions and provide perspectives for future research directions.},
author = {Ivanovic-Burmazovic, Ivana and Filipovic, Milos R.},
doi = {10.1021/acs.inorgchem.8b02592},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {CRIS-Team WoS Importer:2019-04-18},
pages = {4039-4051},
peerreviewed = {Yes},
title = {{Saying} {NO} to {H2S}: {A} {Story} of {HNO}, {HSNO}, and {SSNO}-},
volume = {58},
year = {2019}
}
@article{faucris.118864284,
author = {Miljkovic, Jan and Eberhardt, Miriam and Herrmann, Martin and Meßlinger, Karl and Reeh, Peter and Ivanovic-Burmazovic, Ivana and Filipovic, Milos},
doi = {10.1016/j.niox.2013.06.023},
faupublication = {yes},
journal = {Nitric Oxide-Biology and Chemistry},
pages = {16},
peerreviewed = {Yes},
title = {{Saying} {NO} to {H2S}},
url = {http://www.sciencedirect.com/science/article/pii/S1089860313001778},
volume = {31},
year = {2013}
}
@article{faucris.230053079,
abstract = {Zivanovic et al. develop a robust method for chemoselective persulfide labeling using dimedone-based probes to show that persulfidation is an evolutionarily conserved post-translational modification used by the cells to protect proteins from overoxidation caused by different stressors. Higher persulfidation levels, caused by pharmacological or dietary interventions, lead to better resistance to oxidative stress and longer life.},
author = {Zivanovic, Jasmina and Kouroussis, Emilia and Kohl, Joshua B. and Adhikari, Bikash and Bursac, Biljana and Schott-Roux, Sonia and Petrovic, Dunja and Miljkovic, Jan Lj and Thomas-Lopez, Daniel and Jung, Youngeun and Miler, Marko and Mitchell, Sarah and Milosevic, Verica and Gomes, Jose Eduardo and Benhar, Moran and Gonzales-Zorn, Bruno and Ivanovic-Burmazovic, Ivana and Torregrossa, Roberta and Mitchell, James R. and Whiteman, Matthew and Schwarz, Guenter and Snyder, Solomon H. and Paul, Bindu D. and Carroll, Kate S. and Filipovic, Milos R.},
doi = {10.1016/j.cmet.2019.10.007},
faupublication = {yes},
journal = {Cell Metabolism},
keywords = {aging; calorie restriction; hydrogen peroxide; hydrogen sulfide; protein persulfidation; redox signaling; sulfenylation; sulfinylation; sulfonylation},
note = {CRIS-Team Scopus Importer:2019-12-03},
pages = {1152-1170.e13},
peerreviewed = {Yes},
title = {{Selective} {Persulfide} {Detection} {Reveals} {Evolutionarily} {Conserved} {Antiaging} {Effects} of {S}-{Sulfhydration}},
volume = {30},
year = {2019}
}
@article{faucris.229749945,
abstract = {Mo complexes are currently the most active catalysts for nitrogen fixation under ambient conditions. In comparison, tungsten platforms are scarcely examined. For active catalysts, the control of N2vs. proton reduction selectivities remains a difficult task. We here present N2 splitting using a tungsten pincer platform, which has been proposed as the key reaction for catalytic nitrogen fixation. Starting from [WCl3(PNP)] (PNP = N(CH2CH2PtBu2)2), the activation of N2 enabled the isolation of the dinitrogen bridged redox series [(N2){WCl(PNP)}2]0/+/2+. Protonation of the neutral complex results either in the formation of a nitride [W(N)Cl(HPNP)]+ or H2 evolution and oxidation of the W2N2 core, respectively, depending on the acid and reaction conditions. Examination of the nitrogen splitting vs. proton reduction selectivity emphasizes the role of hydrogen bonding of the conjugate base with the protonated intermediates and provides guidelines for nitrogen fixation.},
author = {Schluschaß, Bastian and Abbenseth, Josh and Demeshko, Serhiy and Finger, Markus and Franke, Alicja and Herwig, Christian and Würtele, Christian and Ivanovic-Burmazovic, Ivana and Limberg, Christian and Telser, Joshua and Schneider, Sven},
doi = {10.1039/c9sc03779a},
faupublication = {yes},
journal = {Chemical Science},
note = {CRIS-Team Scopus Importer:2019-11-26},
pages = {10275-10282},
peerreviewed = {Yes},
title = {{Selectivity} of tungsten mediated dinitrogen splitting vs. proton reduction},
volume = {10},
year = {2019}
}
@article{faucris.216854929,
abstract = {
The application of large M
12
L
24
nanospheres allows the pre-concentration of catalysts to reach high local concentrations, facilitating reactions that proceed through dinuclear mechanisms. The mechanism of the copper(i)-catalyzed cyclization of 4-pentynoic acid has been elucidated by means of a detailed mechanistic study. The kinetics of the reaction show a higher order in copper, indicating the formation of a bis-Cu intermediate as the key rate determining step of the reaction. This intermediate was further identified during catalysis by CIS-HRMS analysis of the reaction mixture. Based on the mechanistic findings, an M
12
L
24
nanosphere was applied that can bind up to 12 copper catalysts by hydrogen bonding. This pre-organization of copper catalysts in the nanosphere results in a high local concentration of copper leading to higher reaction rates and turnover numbers as the dinuclear pathway is favored.
},
author = {Gonell, Sergio and Caumes, Xavier and Orth, Nicole and Ivanovic-Burmazovic, Ivana and Reek, Joost N. H.},
doi = {10.1039/c8sc03767a},
faupublication = {yes},
journal = {Chemical Science},
note = {CRIS-Team Scopus Importer:2019-05-02},
pages = {1316-1321},
peerreviewed = {Yes},
title = {{Self}-assembled {M12L24nanospheres} as a reaction vessel to facilitate a dinuclear {Cu}(i) catalyzed cyclization reaction},
volume = {10},
year = {2019}
}
@article{faucris.117874944,
abstract = {Tuning reagent and catalyst concentrations is crucial in the development of efficient catalytic transformations. In enzyme-catalysed reactions the substrate is bound-often by multiple non-covalent interactions-in a well-defined pocket close to the active site of the enzyme; this pre-organization facilitates highly efficient transformations. Here we report an artificial system that co-encapsulates multiple catalysts and substrates within the confined space defined by an M12L24 nanosphere that contains 24 endohedral guanidinium-binding sites. Cooperative binding means that sulfonate guests are bound much more strongly than carboxylates. This difference has been used to fix gold-based catalysts firmly, with the remaining binding sites left to pre-organize substrates. This strategy was applied to a Au(I)-catalysed cyclization of acetylenic acid to enol lactone in which the pre-organization resulted in much higher reaction rates. We also found that the encapsulated sulfonate-containing Au(I) catalysts did not convert neutral (acid) substrates, and so could have potential in the development of substrate-selective catalysis and base-triggered on/off switching of catalysis.},
author = {Wang, Qi-Qiang and Gonell, Sergio and Leenders, Stefan H.A.M and Dürr, Maximilian and Ivanovic-Burmazovic, Ivana and Reek, Joost N.H.},
doi = {10.1038/nchem.2425},
faupublication = {yes},
journal = {Nature chemistry},
pages = {225-30},
peerreviewed = {Yes},
title = {{Self}-assembled nanospheres with multiple endohedral binding sites pre-organize catalysts and substrates for highly efficient reactions.},
volume = {8},
year = {2016}
}
@article{faucris.238598658,
abstract = {We report on five tetranuclear metallamacrocycles with particularly large inner voids of up to 19.4 × 18.9 Å. The macrocyclic complexes were obtained by the self-assembly of spatially extended organic dicarboxylate linkers with two different dinuclear bis(alkenyl) diruthenium precursors. The five complexes include one pair of constitutional isomers, complexes 2-NB and 2-BN, which differ with respect to whether the incorporated triarylamine functionality is part of the "conductive" π-conjugated (2-NB) or the insulating dicarboxylate linkers (2-BN). All macrocyclic complexes were characterized by NMR spectroscopy, UHR ESI mass spectrometry, cyclic and square wave voltammetry, and in two instances by X-ray diffraction studies on single crystals. We also investigated the properties of their various oxidized forms via IR/NIR and UV/vis/NIR spectroelectrochemistry as well as by EPR spectroscopy. DFT studies provide further insight into the structural and electronic properties of these compounds.},
author = {Fink, Daniel and Orth, Nicole and Ebel, Viktoria and Gogesch, Franciska S. and Staiger, Anne and Linseis, Michael and Ivanovic-Burmazovic, Ivana and Winter, Rainer F.},
doi = {10.1021/acs.organomet.0c00116},
faupublication = {yes},
journal = {Organometallics},
note = {CRIS-Team Scopus Importer:2020-05-22},
peerreviewed = {Yes},
title = {{Self}-{Assembled} {Redox}-{Active} {Tetraruthenium} {Macrocycles} with {Large} {Intracyclic} {Cavities}},
year = {2020}
}
@article{faucris.120218824,
abstract = {The reactions of seven-coordinate [Fe(dapsox)(H O)]Cl0·HO (1), [Fe (Hdapsox)(HO)](NO )·HO (2), and [Mn(H dapsox)(CHOH)(HO)](ClO) (HO) (3) complexes of the acyclic and rigid pentadentate Hdapsox ligand [Hdapsox = 2,6- diacetylpyridinebis(semioxamazide)] with superoxide have been studied spectrophotometrically, electrochemically, and by a submillisecond mixing UV/vis stopped-flow in dimethyl sulfoxide (DMSO). The same studies were performed on the seven-coordinate [Mn(Me[15]pyridinaneN )(HO)]Cl·HO (4) complex with the flexible macrocyclic Me[15]pyridinaneN ligand (Me[15]pyridinaneN = trans-2,13-dimethyl-3,6,9,12,18-pentaazabicyclo-[12.3.1]octadeca-1(18),14, 16-triene), which belongs to the class of proven superoxide dismutase (SOD) mimetics. The X-ray crystal structures of 2-4 were determined. All complexes possess pentagonal-bipyramidal geometry with the pentadentate ligand in the equatorial plane and solvent molecules in the axial positions. The stopped-flow experiments in DMSO (0.06% of water) reveal that all four metal complexes catalyze the fast disproportionation of superoxide under the applied experimental conditions, and the catalytic rate constants are found to be (3.7 ± 0.5) × 10, (3.9 ± 0.5) × 10, (1.2 ± 0.3) × 10, and (5.3 ± 0.8) × 10 M s for 1-4, respectively. The cytochrome c McCord-Fridovich (McCF) assay in an aqueous solution at pH = 7.8 resulted in the IC values (and corresponding k constants) for 3 and 4, 0.013 ± 0.001 μM (1.9 ± 0.2 × 10 M s) and 0.024 ± 0.001 μM (1.1 ± 0.3 × 10 M s), respectively. IC values from a nitroblue tetrazolium assay are found to be 6.45 ± 0.02 and 1.36 ± 0.03 μM for 1 and 4, respectively. The data have been compared with those obtained by direct stopped-flow measurements and discussed in terms of the side reactions that occur under the conditions of indirect assays. © 2007 American Chemical Society.},
author = {Liu, Gaofeng and Filipovic, Milos and Heinemann, Frank Wilhelm and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic7012039},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {8825-8835},
peerreviewed = {Yes},
title = {{Seven}-coordinate iron and manganese complexes with acyclic and rigid pentadentate chelates and their superoxide dismutase activity},
volume = {46},
year = {2007}
}
@article{faucris.120219044,
abstract = {Interactions between the seven-coordinate tweezerlike [Fe(dapsox)(H O)]ClO complex (Hdapsox = 2,6-diacetylpyridine-bis(semioxamazide)) with different lithium salts (LiOTf, LiClO, LiBF, and LiPF) in CHCN have been investigated by electrochemical, spectrophotometric, Li and F NMR, kinetic, and DFT methods. It has been demonstrated that this complex acts as ditopic receptor, showing spectral and electrochemical ion-pair-sensing capability for different lithium salts. In general, the apparent binding constants for lithium salts increase in the order LiOTf < LiClO < LiBF. From the electrochemical measurements, the apparent lithium salt binding constants for the Fe(III) and Fe(II) forms of the complex have been obtained, suggesting a stronger host-guest interaction with the reduced form of the complex. In the presence of LiPF, the solution chemistry is more complex because of the hydrolysis of PF . The kinetics of the complexation of [Fe(dapsox)(CHCN)] by thiocyanate at -15°C in acetonitrile in the presence of 0.2 M NBuOTf shows two steps with the following rate constants and activation parameters: k = 411 ± 14 M s; ΔH = 9 ± 2 kJ mol; ΔS = -159 ± 6 J K mol; k = 52 ± 1 M s; ΔH = 4 ± 1 kJ mol; ΔS = -195 ± 3 J K mol. The very negative ΔS values are consistent with an associative (A) mechanism. Under the same conditions but with 0.2 M LiOTf, k and k are 1605 ± 51 and 106 ± 2 M s respectively. The increased rate constants for the {[Fe(dapsox)(CHCN)]-LiOTf} adduct are in agreement with an associative mechanism. Kinetic and spectrophotometric titration measurements show stronger interaction between the lithium salt and the anion-substituted forms, [Fe(dapsox)(CHCN)(NCS)] and [Fe(dapsox)(NCS)], of the complex. These experiments demonstrate that in nonaqueous media lithium salts cannot be simply used as supporting electrolytes, since they can affect the kinetic behavior of the studied complex. DFT calculations revealed that the negatively charged α-oxyazine oxygen atoms are responsible for cation binding (electrostatic interactions), whereas the two terminal amide groups bind the anion via hydrogen bonding. © 2007 American Chemical Society.},
author = {Sarauli, David and Popova, Vesselina and Zahl, Achim and Puchta, Ralph and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic7005056},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {7848-7860},
peerreviewed = {Yes},
title = {{Seven}-coordinate iron complex as a ditopic receptor for lithium salts: {Study} of host-guest interactions and substitution behavior},
volume = {46},
year = {2007}
}
@article{faucris.120219264,
abstract = {The intermolecular interactions between a ruthenium-based photosensitizer ([Ru(tbbpy)(biH)]) and a molecular metal oxide ([β-MoO]) are investigated in solution and in the solid state. The supramolecular interactions were studied using H-NMR, UV-Vis and emission spectroscopy, ESI mass spectrometry and single-crystal X-ray diffraction. The formation of supramolecular aggregates was observed both in the crystal lattice and in solution. In addition, it is shown that aggregation in solution can be controlled by the competitive formation of ion pairs. © 2011 The Royal Society of Chemistry.},
author = {Heußner, Kirsten and Peuntinger, Katrin and Rockstroh, Nils and Nye, Leanne and Ivanovic-Burmazovic, Ivana and Rau, Sven and Streb, Carsten},
doi = {10.1039/c1cc11859e},
faupublication = {yes},
journal = {Chemical Communications},
pages = {6852-6854},
peerreviewed = {Yes},
title = {{Solution} and solid-state interactions in a supramolecular ruthenium photosensitizer-polyoxometalate aggregate},
volume = {47},
year = {2011}
}
@article{faucris.120210684,
author = {Dürr, Katharina L. and Tröppner, Oliver and Olah, J. and Li, Jing and Zahl, Achim and Drewello, Thomas and Jux, Norbert and Harvey, Jeremy N. and Ivanovic-Burmazovic, Ivana},
doi = {10.1039/c1dt11521a},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {546-557},
peerreviewed = {Yes},
title = {{Solution} behavior of iron(iii) and iron(ii) porphyrins in {DMSO} and reaction with superoxide. {Effect} of neighboring positive charge on thermodynamics, kinetics and nature of iron-(su)peroxo product},
volume = {41},
year = {2012}
}
@article{faucris.226871943,
abstract = {We report the polymerization of a solvent-stabilized molecular strontium vanadium oxide monomer into infinite 1D chains. Supramolecular polymerization is triggered by controlled solvent-exchange, which leads to oligomer and polymer formation. Mechanistic insights into the chain formation were obtained by solid-state, solution, and gas-phase studies. The study shows how reactivity control of molecular metal oxides can be used to assemble complex inorganic polymeric structures.},
author = {Schwarz, Benjamin and Dürr, Maximilian and Kastner, Katharina and Heber, Nora and Ivanovic-Burmazovic, Ivana and Streb, Carsten},
doi = {10.1021/acs.inorgchem.9b01665},
faupublication = {yes},
journal = {Inorganic Chemistry},
note = {CRIS-Team WoS Importer:2019-09-20},
pages = {11684-11688},
peerreviewed = {Yes},
title = {{Solvent}-{Controlled} {Polymerization} of {Molecular} {Strontium} {Vanadate} {Monomers} into {1D} {Strontium} {Vanadium} {Oxide} {Chains}},
volume = {58},
year = {2019}
}
@article{faucris.121423324,
abstract = {A detailed kinetic study of the substitution behavior of the seven-coordinate [Fe(dapsox)(L)]ClO complex (H -dapsox = 2,6-diacetylpyridine-bis(semioxamazide), L = solvent or its deprotonated form) with thiocyanate as a function of the thiocyanate concentration, temperature, and pressure was undertaken in protic (EtOH and acidified EtOH and MeOH) and aprotic (DMSO) organic solvents. The lability and substitution mechanism depend strongly on the selected solvent (i.e., on solvolytic and protolytic processes). In the case of alcoholic solutions, substitution of both solvent molecules by thiocyanate could be observed, whereas in DMSO only one substitution step occurred. For both substitution steps, [Fe(dapsox)(L)]ClO shows similar mechanistic behavior in methanol and ethanol, which is best reflected by the values of the activation volumes (MeOH ΔV = +15.0 ± 0.3 cm mol, ΔV = +12.0 ± 0.2 cm mol; EtOH ΔV = +15.8 ± 0.7 cm mol, ΔV = +11.1 ± 0.5 cm mol ). On the basis of the reported activation parameters, a dissociative (D) mechanism for the first substitution step and a D or dissociative interchange (I) mechanism for the second substitution step are suggested for the reaction in MeOH and EtOH. This is consistent with the predominant existence of alcoxo [Fe(dapsox)(ROH)(OR)] species in alcoholic solutions. In comparison, the activation parameters for the substitution of the aqua-hydroxo [Fe(dapsox)(HO)(OH)] complex by thiocyanate at pH 5.1 in MES were determined to be ΔH = 72 ± 3 kJ mol , ΔS = +38 ± 11 J K mol, and ΔV = -3.0 ± 0.1 cm mol, and the operation of a dissociative interchange mechanism was suggested, taking the effect of pressure on the employed buffer into account. The addition of triflic acid to the alcoholic solutions ([HOTf] = 10 and 10 M to MeOH and EtOH, respectively) resulted in a drastic changeover in mechanism for the first substitution step, for which an associative interchange (I) mechanism is suggested, on the basis of the activation parameters obtained for both the forward and reverse reactions and the corresponding volume profile. The second substitution step remained to proceed through an I or D mechanism (acidified MeOH ΔV = +9.2 ± 0.2 cm mol ; acidified EtOH ΔV = +10.2 ± 0.2 cm mol). The first substitution reaction in DMSO was found to be slowed by several orders of magnitude and to follow an associative interchange mechanism (ΔS = -50 ± 9 J K mol, ΔV = -1.0 ± 0.5 cm mol), making DMSO a suitable solvent for monitoring substitution processes that are extremely fast in aqueous solution. © 2006 American Chemical Society.},
author = {Ivanovic-Burmazovic, Ivana and Hamza, Mohamed and van Eldik, Rudi},
doi = {10.1021/ic0514694},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {1575-1584},
peerreviewed = {Yes},
title = {{Solvent} tuning of the substitution behavior of a seven-coordinate iron({III}) complex},
volume = {45},
year = {2006}
}
@article{faucris.121250184,
abstract = {Crossing the line: A pH-induced "crossover" in 3D shapes of supramolecular constructs derived from trans(NH)Pt , [Pd(en)], and the purine model nucleobase 9-methylhypoxanthine (see figure) is reported in which [Pd(en)(H O)] and [Pd(en)(OH)] are the decisive players (en=ethylenediamine). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Albertí, Francisca M. and Zielinski, Witold and Cerda, Marta Morell and Sanz Miguel, Pablo J. and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Lippert, Bernhard},
doi = {10.1002/chem.201300446},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {9800-9806},
peerreviewed = {Yes},
title = {{Stepwise} coordination of {PtII}-180°and {PdII}- 90°metal fragments to the purine nucleobase 9-methylhypoxanthine affords a closed octadecanuclear {Pt6Pd12} cluster},
volume = {19},
year = {2013}
}
@article{faucris.111902384,
abstract = {Breath-taking activation: Stereoregular carbene polymerization proceeds via cationic [(allyl)Rh -polymeryl] species. These are most efficiently generated by oxygenation of the [(diene)Rh ] precatalysts, which involves an unusual rearrangement of 2-rhodaoxetane intermediates. This discovery gives detailed insight in the reaction mechanism. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Walters, Annemarie J.C. and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Tejel, Cristina and del Rio, M. Pilar and Reek, Joost N.H. and De Bruin, Bas},
doi = {10.1002/anie.201200069},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {5157-5161},
peerreviewed = {Yes},
title = {{Stereospecific} carbene polymerization with oxygenated {Rh}(diene) species},
volume = {51},
year = {2012}
}
@article{faucris.107439024,
abstract = {[Figure Presented] macrophage Removing cytotoxics: A Mn- pentaazamacrocycle removes NO; Cy and their ONOO product as shown by real-time amperometry at single cells (see picture). This is the first compound able to completely abolish the cytotoxic effects of reactive oxygen (ROS) and reactive nitrogen species (RNS) in inflammation. © 2010 Wlley-VCH Verlag GmbH & Co. KGaA.},
author = {Filipovic, Milos and Koh, Alaric C.W. and Arbault, Stephane and Niketic, Vesna and Debus, Andrea and Schleicher, Ulrike and Bogdan, Christian and Guille, Manon and Lemaitre, Fréderic and Amatore, Christian and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/anie.200905936},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {4228-4232},
peerreviewed = {Yes},
title = {{Striking} inflammation from both sides: {Manganese}({II}) pentaazamacrocyclic {SOD} mimics act also as nitric oxide dismutases: {A} single-cell study},
volume = {49},
year = {2010}
}
@article{faucris.121251064,
abstract = {The reaction of [Mo(NNCH)(dppe)] (B) with an excess of acid, HNEtBPh, is investigated applying temperature-dependent stopped-flow measurements. The kinetic data indicate a biphasic process with rate constants k and K which are both slower than the single rate constant reported by Henderson et al. (Henderson, R. A.; Leigh, G. J.; Pickett, C. J., J, Chem. Soc., Dalton Trans. 1989, 425-430). Moreover, both rate constants exhibit a linear dependence on the acid concentration with a large intercept which is attributed to acid-dependent and acid-independent components of each reaction phase, respectively. All four reaction channels exhibit temperature-dependent reaction rates. Furthermore, B and its Mo(IV) analogue [MoBr(NNCH)(dppe)]Br (A) are characterized structurally and spectroscopically. Density-functional theory calculations are performed to locate possible barriers in the overall reaction scheme and determine their energies, providing additional information for the formulation of a mechanism. The temperature-dependent rate of N-N cleavage is explained by a revised mechanism which involves an α-protonated intermediate that is inert with respect to N-N cleavage and is generated from its β-protonated counterpart by a rapid 1,2-proton shift. The implications of these results with respect to N reduction in the Chatt cycle and the enzyme nitrogenase are discussed. © 2009 American Chemical Society.},
author = {Dreher, Ameli and Mersmann, Klaus and Näther, Christian and Ivanovic-Burmazovic, Ivana and van Eldik, Rudi and Tuczek, Felix},
doi = {10.1021/ic801952v},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {2078-2093},
peerreviewed = {Yes},
title = {{Structural}, spectroscopic, and kinetic investigation of the molybdenum dialkylhydrazido complexes [{MoBr}({NNC5H10})(dppe) 2]{Br} and [{Mo}({NNC5H10})(dppe)2]: {Activation} parameters and revised mechanism for {N}-{N} cleavage},
volume = {48},
year = {2009}
}
@article{faucris.121251284,
abstract = {We demonstrate that a one electron reduced product of the heme iron dioxygen adduct exists in solution not only as the commonly accepted iron(iii)-peroxo species, but coexists with its isomeric iron(ii)-superoxo form. This unusual reduced metal-superoxide adduct [M(ii)-O] is recently reported as a reactive intermediate in the case of non-heme extradiol dioxygenases and could also be generated by cryoreduction of a heme Fe-O adduct. The existence of iron(ii)-superoxo species in solution is consistent with IR, EPR, mass and Mössbauer spectra. The equilibrium between heme iron(iii)-peroxo and iron(ii)-superoxo forms is supported by density functional theory and explains our previous finding that upon release of coordinated (su)peroxide a corresponding iron(ii) complex remains. These results shed new light on the nature of heme iron(iii)-peroxo species that are key intermediates in the metalloenzyme-catalyzed dioxygen and hydrogen peroxide activation. © 2010 The Royal Society of Chemistry.},
author = {Dürr, Katharina L. and Olah, Julianna and Davydov, Roman and Kleimann, Michael and Li, Jing and Lang, Nina and Puchta, Ralph and Hübner, Eike and Drewello, Thomas and Harvey, Jeremy N. and Jux, Norbert and Ivanovic-Burmazovic, Ivana},
doi = {10.1039/b920237d},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {2049-2056},
peerreviewed = {Yes},
title = {{Studies} on an iron(iii)-peroxo porphyrin. {Iron}(iii)-peroxo or iron(ii)-superoxo?},
volume = {39},
year = {2010}
}
@article{faucris.238362005,
abstract = {Coordination geometries of transition metals play vital roles in the self-assembly process of supramolecular coordination complexes. Herein, seven-coordinate 3d metal ions were applied as templates and catalytically active sites for subcomponent self-assembly that resulted in a new category of covalent metallacycles. Single-crystal structures showed that the sizes, configurations, and functionalization of covalent metallacycles could be tuned by the selection of rigid dihydrazide, transition metal ions, and prefunctionalized subcomponents, respectively. Moreover, metallacycles decorated with carboxylic groups could be employed as precursors to prepare aerogels through hierarchical self-assembly, which also exhibited high catalytic activity for cycloaddition of CO2 into cyclic carbonates.},
author = {Li, Zhi-Wei and Wang, Xin and Wei, Lian-Qiang and Ivanovic-Burmazovic, Ivana and Liu, Gao-Feng},
doi = {10.1021/jacs.0c01035},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team WoS Importer:2020-05-15},
pages = {7283-7288},
peerreviewed = {Yes},
title = {{Subcomponent} {Self}-{Assembly} of {Covalent} {Metallacycles} {Templated} by {Catalytically} {Active} {Seven}-{Coordinate} {Transition} {Metal} {Centers}},
volume = {142},
year = {2020}
}
@article{faucris.120219484,
abstract = {In order to clarify the solution chemistry of 3d metal hepta-coordinate complexes, a detailed mechanistic study of the two-step substitution reaction between the "tweezer-like" iron(III) complex, [Fe(dapsox)(HO)] (Hdapsox=2,6-diacetylpyridine-bis(semioxamazide)), and SCN was performed in water and methanol as solvents. Based on the observed rate law and reported activation parameters (ΔH, ΔS and ΔV) for both reaction steps in aqueous solution, the operation of an I mechanism for the diaqua, an I mechanism for the aquathiocyanato, and an I or D mechanism for the aquahydroxo forms of the Fe(III) complex, is proposed. The operation of a limiting D mechanism is proposed for both reaction steps in methanol as solvent. © 2002 Elsevier Science B.V. All rights reserved.},
author = {Ivanovic-Burmazovic, Ivana and Hamza, Mohamed and van Eldik, Rudi},
doi = {10.1016/S1387-7003(02)00607-X},
faupublication = {yes},
journal = {Inorganic Chemistry Communications},
pages = {937-940},
peerreviewed = {Yes},
title = {{Substitution} behaviour of an unusual seven-coordinate iron({III}) complex in different solvents},
volume = {5},
year = {2002}
}
@article{faucris.201113912,
author = {Kenkel, Isabell and Franke, Alicja and Dürr, Maximilian and Zahl, Achim and Dücker-Benfer, Carlos and Langer, Jens and Filipovic, Milos and Yu, Meng and Puchta, Ralph and Fiedler, Stephanie R. and Shores, Matthew P. and Goldsmith, Christian R. and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/jacs.6b08394},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {1472-1484},
peerreviewed = {Yes},
title = {{Switching} between inner- and outer-sphere {PCET} mechanisms of small-molecule activation: {Superoxide} dismutation and oxygen/superoxide reduction reactivity deriving from the same manganese complex},
volume = {139},
year = {2017}
}
@article{faucris.120219924,
abstract = {The synthesis of a novel ligand 2′-[1-(2-pyridinyl)- ethylidene]-oxamohydrazide (Hapsox), from a series of 2-acetylpyridine acylhydrazones, and its complex with Co(III), which is the first in this series of complexes are described. Both the ligand and the complex were characterized by elemental analysis, IR, H-NMR, and C-NMR spectra, and the structure of the complex [Co(apsox)]ClO was determined by X-ray structural analysis. It was established that [Co(apsox)]ClO has an octahedral geometry with two tridentate apsox ligands in monoanionic form. Structural characteristics, lengths of the bonds, and angles between the bonds were typical for Co(III) complexes of distorted octahedral geometry. Both direct and template synthesis afforded the same geometrical isomer of the complex with two apsox ligands meridionally bound to the central metal ion, even in the case when equimolar quantities of Co(ClO) and Hapsox were applied.},
author = {Andjelkovic, K. and Howing, Jonas and Tellgren, Roland and Jeremic, D. and Ivanovic-Burmazovic, Ivana and Sladic, D.},
doi = {10.1080/0095897031000113986},
faupublication = {no},
journal = {Journal of Coordination Chemistry},
pages = {611-622},
peerreviewed = {Yes},
title = {{Synthesis} and structural characterization of the {Co}({III}) complex with 2′-[1-(2-pyridinyl)-ethylidene]-oxamohydrazide ({Hapsox}): {The} crystal structure of bis-{2′-[1-(2-pyridinyl)-ethylidene]-oxamohydrazido} cobalt({III}) perchlorate, [{Co}(apsox)2]{ClO4}},
volume = {56},
year = {2003}
}
@article{faucris.120221024,
abstract = {In a template synthesis from copper(II) acetate, 2,6-diacetylpyridine, and semioxamazide (NHCO CONHNH), two new copper(II) complexes, [Cu(dapsox)(HO)] · H2O and [Cu(dapsox)(HO)]ClO, (where Hdapsox = 2′,2‴-(2,6-pyridindiyldiethylidene)dioxamohydrazide) were obtained and characterized. The structure of the former complex was determined by a single-crystal X-ray analysis. Cu is located in a square pyramidal environment. The polydentate ligand, dapsox, is coordinated in dianionic form, as an unsymmetrical quadridentate planar system forming one six-membered and two five-membered metal-chelate rings. The fifth coordination site is occupied by a water molecule. © 1997 Elsevier Science Ltd.},
author = {Andjelkovic, K. and Ivanovic-Burmazovic, Ivana and Niketic, S. R. and Prelesnik, Bogdan and Leovac, V.},
faupublication = {no},
journal = {Polyhedron},
pages = {4221-4228},
peerreviewed = {Yes},
title = {{Synthesis} and structure of aqua-2′,2â´-(2,6-pyridindiyldiethylidene)dioxamohydrazide-copper({II}) hydrate},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0001380606&origin=inward},
volume = {16},
year = {1997}
}
@article{faucris.121256344,
abstract = {The complex [Co(HL) (HO) (MeOH)] (ClO)[HL] = 2′,2‴-(2,6-pyridindiyl-diethylidene)-dioxamohydrazide] has been prepared by direct and template syntheses and characterized by elemental analysis, IR spectroscopy, and magnetic susceptibility measurements. The crystal structure of the complex has also been determined. The cobalt atom is seven coordinated with approximately pentagonal-bipyramidal geometry. The HO and methanol are axial with the planar pentadentate HL ligand forming the equatorial plane. The possible reaction mechanism has been proposed.},
author = {Andelkovic, K. and Ivanovic-Burmazovic, Ivana and Prelesnik, Bogdan and Leovac, V. and Poleti, D.},
doi = {10.1016/0277-5387(96)00234-3},
faupublication = {no},
journal = {Polyhedron},
pages = {4361-4366},
peerreviewed = {Yes},
title = {{Synthesis} and structure of aquamethanol-2′,2â´-(2,6-pyridin-diyldiethylidene)- dioxamohydrazidocobalt({II}) perchlorate},
volume = {15},
year = {1996}
}
@article{faucris.222688938,
abstract = {Oxidative stress emerged as target in drug discovery due to its diverse role in various diseases, such as cardiovascular, neurodegenerative, and autoimmune diseases. During the last decades, considerable progress was made in the development of compounds with the ability to reduce reactive oxygen species (ROS) like superoxide. However, the dismutation of the latter leads to formation of another harmful ROS, hydrogen peroxide, which can be depleted through peroxidase activity. The present work describes the synthesis of a hybrid, which unifies a superoxide dismutase mimetic, MnIIpyane, and a glutathione peroxidase mimetic, ebselen, that are connected via an amide bond. This unique hybrid is designed in order to convert superoxide into oxygen and water, i.e. as a potential biological agent for complete ROS removal and will be used in the future as mechanistic molecular tool for further elucidation of (patho) physiological consequences of ROS removal.},
author = {Orth, Nicole and Scheitler, Andreas and Josef, Verena and Franke, Alicja and Zahl, Achim and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/ejic.201900407},
faupublication = {yes},
journal = {European Journal of Inorganic Chemistry},
keywords = {Ebselen; GPx mimetic; Manganese; ROS; SOD mimetic; Synthesis design},
note = {CRIS-Team Scopus Importer:2019-07-19},
peerreviewed = {Yes},
title = {{Synthesis} of a {Hybrid} between {SOD} {Mimetic} and {Ebselen} to {Target} {Oxidative} {Stress}},
volume = {2019},
year = {2019}
}
@article{faucris.111920644,
abstract = {A novel intercluster compound, [(n-CH) P][HVO] (IL01-V), constructed from the tetrabutylphosphonium cation and decavanadate, has been synthesized and unequivocally characterized by elemental analysis, FTIR spectroscopy, mass spectrometry, X-ray crystallography, and solution H, C, P{H}, and V NMR spectroscopy. Compound IL01-V was formed by ionic interaction between the phosphonium cation and the decavanadate anion. Cryospray high-resolution mass spectrometry revealed the [HV O] cluster remains intact in solution. Three further phosphonium polyoxovanadates were synthesized and characterized by the same techniques as used for IL01-V. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Mal, Sib Sankar and Tröppner, Oliver and Ivanovic-Burmazovic, Ivana and Burger, Peter},
doi = {10.1002/ejic.201201447},
faupublication = {yes},
journal = {European Journal of Inorganic Chemistry},
pages = {1960-1967},
peerreviewed = {Yes},
title = {{Tetraalkylphosphonium} decavanadates: {Synthesis}, structures, and solution properties},
volume = {null},
year = {2013}
}
@article{faucris.111925044,
abstract = {Fe(III) and Mn(III) complexes of an aza-crown ether/porphyrin conjugate, 5-N-(4-aza-18-crown-6)methyl-5,10,15 ,20-tetra-tert-butyl-5-methyl-5,10,15,20- tetraphenylporphyrin, with Cl and Br as respective counter ions, are studied by electrospray ionisation (ESI)-mass spectrometry (MS). Fragmentation pathways are established by MS and MS collision-induced dissociation (CID) experiments performed with a quadrupole ion trap (QIT) and energy-dependent CID is studied with a quadrupole/time-of-flight (q-ToF) instrument. Singly charged ions are produced by selective protonation, sodiation or potassiation of the crown ether moiety, and dications possess one additional charge on the halide-released porphyrin metal cation. Singly charged parent ions undergo a two-step decay. Firstly, an "ion pair" is lost, composed of the cationic charge carrier of the crown ether and the anionic counter ion at the porphyrin. Secondly, the intact crown ether is released. The threshold of this process is dependent on the nature of the central porphyrin metal, with Fe(III) dramatically facilitating the reaction. The dications undergo two different Coulomb explosions: crown/porphyrin-fission and cation loss from the crown ether, the ratio of which is dependent on the affinity of the cation to the crown ether. © 2013 Elsevier B.V. All rights reserved.},
author = {Li, Jing and Dürr, Katharina L. and von Gernler, Marc and Jux, Norbert and Ivanovic-Burmazovic, Ivana and Drewello, Thomas},
doi = {10.1016/j.ijms.2013.09.004},
faupublication = {yes},
journal = {International Journal of Mass Spectrometry},
pages = {406-413},
peerreviewed = {Yes},
title = {{The} dissociation behaviour of a singly and doubly charged (cationised) aza-crown ether/metalloporphyrin-conjugate: {Metal}-induced reactivity and {Coulomb} explosions {Dedication}: {In} memory of {Prof}. {Detlef} {Schröder}.},
year = {2013}
}
@article{faucris.120220144,
abstract = {The synthesis of two Fe(III) complexes with a doubly deprotonated polydentate of the acylhydrazone class is described. The first complex was obtained by hydrolyzing the previously synthesized high-spin pentagonal-bipyramidal (PBP) [Fe(Hdapsox)Cl] (Hdapsox = 2′,2‴-(2,6-pyridindiyldiethylidene)dioxamohydrazide); the second was obtained by a template synthesis in a base medium starting from iron(III) chloride, 2,6-diacetylpyridine (dap) and semioxamazide (sox) (in a 1:1:2 molar ratio). Hydrolysis, during which the semioxamazide amide group changed into a carboxyl group, resulted in the μ-oxo-diiron(III) complex [Fe(dapoamh)(HO)]O·3HO (Hdapoamh = dioxo-2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)diacetic acid) with a doubly deprotonated acylhydrazone that retained its PBP geometry. The [Fe(dapsox)Cl]·HO complex obtained in the latter case has a square-pyramidal geometry with an asymmetrically coordinated, but still doubly deprotonated dapsox as a tetradentate. The structure of the [Fe(dapoamh)(HO)]O·3HO complex determined by single-crystal X-ray analysis in this work represents the first μ-oxo-dimer of a PBP geometry with an acyclic polydentate. This is also the first diamagnetic μ-oxo-diiron(III) complex ever obtained; this not only points to the super-exchange interaction over an oxo-oxygen, but also to a significant interaction between the two low-spin Fe(III) ion d-orbitals. Based on the EPR spectra, it has been established that the monomer [Fe(dapsox)Cl]·HO complex is among the rare Fe(III) complexes with an intermediate spin state S = 3/2, and that a temperature decrease causes it to change to a low-spin complex, i.e. it demonstrates a cross-over (S = 3/2 ⇄ S = 1/2). Further characterization has been done by IR and UV - VIS spectroscopy, and also by measuring the magnetic momentum at 293, 195 and 77 K. The results of this work, as well as of the previously synthesized Cu(II), Co(II) and Ni(II) complexes with Hdapsox, Hdapsox and dapsox, have led us to the conclusion that the doubly deprotonated acylhydrazone ligand has a considerably stronger field than its neutral or monoanionic forms. © 2001 Elsevier Science B.V.},
author = {Bacchi, Alessia and Ivanovic-Burmazovic, Ivana and Pelizzi, Giancarlo and Andjelkovic, K.},
doi = {10.1016/S0020-1693(00)00377-7},
faupublication = {no},
journal = {Inorganica Chimica Acta},
pages = {109-119},
peerreviewed = {Yes},
title = {{The} {Fe}({III}) complexes with a doubly deprotonated polydentate acylhydrazone: {Crystal} structure of the first diamagnetic μ-oxo-diiron({III}) complex},
volume = {313},
year = {2001}
}
@article{faucris.121253484,
abstract = {Revealing HS (bio)inorganic chemistry: The reaction between sodium nitroprusside ([Fe(CN)NO]) and hydrogen sulfide (HS), known since the late 19th century, was re-investigated by J. A. Olabe and co-workers (Chem. Eur. J. 2011, 17, 4145), where the putative new species with nitrososulfide ligands were characterized ([Fe(CN) N(O)SH] with λ = 570 nm and Fe(CN)N(O)S] with λ = 535 nm; pK=10.5±0.1). In our Correspondence we provide evidence that questions the chemical character of those species and call for further, more physiologically relevant studies. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Filipovic, Milos and Ivanovic-Burmazovic, Ivana},
doi = {10.1002/chem.201103644},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {13538-13540},
peerreviewed = {Yes},
title = {{The} kinetics and character of the intermediates formed in the reaction between sodium nitroprusside and hydrogen sulfide need further clarification},
volume = {18},
year = {2012}
}
@article{faucris.121254364,
abstract = {Results of our research on synthesis and characterization of complexes with acylhydrazone derivatives are described in this review paper. Structural characterization of newly synthesized complexes by thermal analysis (TG, DTA, DSC) is particularly emphasized in this paper. Thermal analysis enabled us to study not only structural changes of substances during thermal treatment, but also the mode of coordination and degree of deprotonation of acylhydrazones, as well as geometry of the coordination sphere of complexes, the structure of which had not been determined by X-ray analysis. Topics in this paper are as follows: complexes of dioxomolybdenum(VI) with tridentate hydrazones, usnic acid derivatives and their Cu(II) complexes, as well as transition metal complexes with 2,6-diacetylpyridine bis(hydrazones).},
author = {Andjelkovic, K. and Sumar, Maja and Ivanovic-Burmazovic, Ivana},
doi = {10.1023/A:1013140021386},
faupublication = {no},
journal = {Journal of Thermal Analysis and Calorimetry},
pages = {759-778},
peerreviewed = {Yes},
title = {{Thermal} analysis in structural characterization of hydrazone ligands and their complexes},
volume = {66},
year = {2001}
}
@article{faucris.120408684,
author = {Tröppner, Oliver and Huang, D. and Holm, R.H. and Ivanovic-Burmazovic, Ivana},
doi = {10.1039/C3DT53004C},
faupublication = {yes},
journal = {Dalton Transactions},
pages = {5274-5279},
peerreviewed = {Yes},
title = {{Thermodynamics} and high-pressure kinetics of a fast carbon dioxide fixation reaction by a (2,6-pyridinedicarboxamidato-hydroxo)nickel({II}) complex},
volume = {43},
year = {2014}
}
@book{faucris.121254584,
abstract = {A [UOclapsox] HO (fydapsox = 2′,2‴-(2,6-pyridindiyldiethyIidine)dioxamohydrazide) has been synthesized and determined by the elemental analysis, the H and C NMR spectra, IC and the electronic absorption spectra, as well as by thermal analysis (DSC and TG). The [UOzdapsox] SFhO complex's geometry is a pentagonal pyramid with two oxo oxygen atoms in apical positions and a planar pentadentate in the equatorial plane. This geometry (existing in spite of the solvents present within the crystal lattice) is resulting from the steric effects imposed by the coordinated acylhydrazone. © 2000 Trans Tech Publications,.},
author = {Ivanovic-Burmazovic, Ivana and Sumar, Maja and Brčeski, I. and Hodzic, Ismet and Andjelkovic, K.},
editor = {Uskokovic D.P.Battiston G.A.Nedeljkovic J.M.Milonjic S.K.Rakovic D.I.},
faupublication = {no},
pages = {277-282},
peerreviewed = {Yes},
publisher = {Trans Tech Publications},
title = {{The} {UO2} 2+ {Complexes} with 2′',2â´-(2,6-{PyridindiyIdiethylidine}){Dioxamohydrazide} ({H2dapsox})},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-0342468863&origin=inward},
volume = {352},
year = {2000}
}
@article{faucris.120443664,
author = {Andjelkovic, K. and Beljanski, V. and Ivanovic-Burmazovic, Ivana and Brceski, I. and Minic, D.},
faupublication = {no},
journal = {Chemical Industry & Chemical Engineering Quarterly},
pages = {351-356},
peerreviewed = {Yes},
title = {{The} {Usnic} {Acid} {Condensation} {Derivates} and their {Copper}({III}) {Complexes} {Thermal} {Behaviour}},
volume = {52},
year = {1998}
}
@article{faucris.118752304,
abstract = {Reversible modification of iron-sulfur clusters by nitric oxide acts as a genetic switch in a group of regulatory proteins. While the conversion of [Fe-S] clusters to iron-nitrosyls has been widely studied in the past, little is known about the reverse process, the repair of [Fe-S] clusters. Reported here is a system in which a mononitrosyl iron complex (MNIC), (PPN)[Fe(S Bu)(NO)] (1), is converted to a [2Fe-2S] cluster, (PPN)[FeS(SCHCH C(O)OMe)] (2). This conversion requires only the addition of a cysteine analogue, 3-mercaptomethylpropionate (MMP), at room temperature without the need for any other reagents. The identity of 2 was confirmed spectroscopically, chemically, crystallographically, and analytically. Mass spectrometry and S labeling studies support that the bridging sulfides in 2 derive from the added MMP, the cysteine analogue. The NO lost during the conversion of 1 to 2 is trapped in a dinitrosyl iron side product, (PPN)[Fe(SCHCHC(O)OMe)(NO)] (4). The present system implies that MNICs are likely intermediates in the repair of NO-damaged [2Fe-2S] clusters and that cysteine is a viable molecule responsible for the destabilization of MINCs and the formation of [2Fe-2S] clusters. © 2014 American Chemical Society.},
author = {Fitzpatrick, Jessica and Kalyvas, Harris and Filipovic, Milos and Ivanovic-Burmazovic, Ivana and MacDonald, John C. and Shearer, Jason and Kim, Eunsuk},
doi = {10.1021/ja5024207},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {7229-7232},
peerreviewed = {No},
title = {{Transformation} of a mononitrosyl iron complex to a [{2Fe}-{2S}] cluster by a cysteine analogue},
volume = {136},
year = {2014}
}
@article{faucris.120409124,
author = {Engel, Matthias and Leffler, Andreas and Niedermirtl, Florian and Babes, Alexandru and Zimmermann, Katharina and Filipovic, Milos and Izydorczyk, Iwona and Eberhardt, Mirjam and Kichko, Tetyana and Müller-Tribbensee, Sonja and Khalil, Mohammad and Siklosi, Norbert and Nau, Carla and Ivanovic-Burmazovic, Ivana and Neuhuber, Winfried and Becker, Christoph and Neurath, Markus and Reeh, Peter},
doi = {10.1053/j.gastro.2011.07.002},
faupublication = {yes},
journal = {Gastroenterology},
pages = {1346-1358},
peerreviewed = {Yes},
title = {{TRPA1} and substance {P} mediate colitis in mice},
volume = {141},
year = {2011}
}
@article{faucris.313784225,
abstract = {A class of Gd(iii) coiled coils achieve high MRI relaxivity, in part due to their slow rotational correlation time. However, extending their length is unable to further enhance performance, as the mechanism by which relaxivity is achieved is dominated by the presence of three inner sphere waters in rapid exchange, through an associative mechanism.},
author = {Newton, S. L. and Franke, Alicja and Zahl, Achim and Molinaro, G. and Kenwright, A. and Smith, D. J. and Ivanovic-Burmazovic, Ivana and Britton, M. M. and Peacock, A. F.A.},
doi = {10.1039/d3dt02909c},
faupublication = {yes},
journal = {Dalton Transactions},
note = {CRIS-Team Scopus Importer:2023-11-10},
peerreviewed = {Yes},
title = {{Understanding} the mechanism by which {Gd}(iii) coiled coils achieve magnetic resonance relaxivity - a study into the water coordination chemistry},
year = {2023}
}
@article{faucris.120212884,
abstract = {The one-electron reduced iron(II)-dioxygen adduct, {Fe-O }, is known to be an important intermediate in the catalytic cycle of heme (mono)oxygenases. The same type of species, considered as Fe-peroxo, can be formed in a direct reaction between a Fe center and superoxide. In a unique high-pressure study of the reaction between superoxide and the Fe complex of a crown ether porphyrin conjugate in dimethylsulfoxide (DMSO), the overall Fe -superoxide interaction mechanism could be visualized and the nature of all species that occur along the reaction coordinate could be clarified. The equilibrium between the low-spin and high-spin forms of the starting Fe complex was quantified, which turns out to be the actual activation step toward substitution and subsequent inner-sphere electron transfer reactions. The constructed reaction volume profile demonstrates that the reaction product consists of Fe-peroxo and Fe -superoxo species that exist in equilibrium, which can better account for the versatile reactivity of {Fe-O} adducts toward different substrates. © 2010 American Chemical Society.},
author = {Dürr, Katharina L. and Jux, Norbert and Zahl, Achim and van Eldik, Rudi and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic102092h},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {11254-11260},
peerreviewed = {Yes},
title = {{Volume} profile analysis for the reversible binding of superoxide to form iron({II})-superoxo/iron({III})-{Peroxo} porphyrin complexes},
volume = {49},
year = {2010}
}
@article{faucris.120220364,
abstract = {In this work the rate constants (kex) and the activation parameters (ΔH, ΔS, and ΔV ) for the water exchange process on Mn centers have experimentally been determined using temperature and pressure dependent O NMR techniques. For the investigations the Mn porphyrin complexes [Mn(TPPS)S2] and [Mn (TMpyP)S2] (S = H2O and/or OH) have been selected due to their high solution stability in a wide pH range, enabling the measurements of water exchange in the case of both diaqua and aqua-hydroxo complexes. We have experimentally demonstrated that the water exchange on Mn porphyrins is a fast process (kex ≈ 10 s ) of an Id to I mechanism, strongly influenced by a Jahn-Teller effect and as such almost independent of a porphyrin charge and a trans ligand. This is also supported by our DFT calculations which show only a slight difference in an average Mn-OH2 bond found for a positively charged model porphyrin with protonated pyridine groups (2.446) and for a simple model without any substituents on the porphyrin ring (2.437). The calculated effective charge on the Mn center, which is significantly lower than its formal +3 charge (ca. +1.5 for diaqua; +1.4 for aqua-hydroxo), also contributes to its substitution lability. The herein presented results are discussed in connection to a possible fast exchanging substrate binding site in photosystem II and corresponding inorganic model complexes, as well as in the context of a possible inner-sphere catalytic pathway for superoxide dismutation on Mn centers.},
author = {Lieb, Dominik and Zahl, Achim and Shubina, Tatyana and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ja1014585},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {7282-7284},
peerreviewed = {Yes},
title = {{Water} exchange on manganese({III}) porphyrins. {Mechanistic} insights relevant for oxygen evolving complex and superoxide dismutation catalysis},
volume = {132},
year = {2010}
}
@article{faucris.121343684,
abstract = {Seven-coordinate manganese(II) complexes [Mn(L)(HO) ], where L represents an equatorial pentadentate macrocyclic ligand with five nitrogen donor atoms, were studied with regard to their acid-base properties, water-exchange rate constants, and corresponding activation parameters (ΔH, ΔS, and ΔV). Three of the studied complexes without imine bonds in the macrocyclic ligand are proven superoxide dismutase (SOD) mimetics. Their water-exchange parameters were compared with those of the imino groups containing complex [Mn(L1)(Cl)] (dichloro-2,13-dimethyl-3,6,9,12,18- pentaazabicyclo[12.3.1]-octadeca-1(18),2,12,14,16-pentaenemanganese(II)), which does not show SOD activity. In addition the X-ray crystal structure of a new complex, dichloro-2,6-bis[1-(2-(N-methylamino)-ethylimino)ethyl]pyridine- manganese(II) [Mn(L2)(Cl)], which is the acyclic analog of [Mn(L1)(Cl)], is reported. Stability constants of the complexes and the pK values of the ligands were measured by potentiometric titration. The titrations of [Mn(L1)(HO)] and [Mn(L2)(HO)] led to complicated species distribution curves because of their ligands containing imine bonds. Water exchange was measured by temperature- and pressure-dependent O NMR techniques. In addition to the measurements on [Mn(EDTA)(HO)] and its derivatives, this is the only study of water exchange on seven-coordinate manganese complexes. The water exchange rate constants vary between 1.6 × 10 s and 5.8 × 10 s at 25°C and are mainly controlled by the π-acceptor abilities of the ligands. The exchange rate constant of the diaqua-1,4,7,10,13- pentaazacyclopentadecanemanganese(II) [Mn([15]aneN)(H O)] complex seems to be even higher but could not be exactly determined. On the basis of the obtained activation parameters, the exchange mechanism of the studied seven-coordinate manganese(II) complexes follows a dissociative pathway (I mechanism). DFT calculations (UB3LYP/LANL2DZp) were performed to obtain the energy required for the dissociation of the coordinated water molecule, that is, the energy difference between the starting seven-coordinate complex and a six-coordinate intermediate. The results have been discussed in terms of the catalytic mechanism of the proven SOD mimetics. © 2007 American Chemical Society.},
author = {Dees, Anne and Zahl, Achim and Puchta, Ralph and van Eikema Hommes, Nico and Heinemann, Frank Wilhelm and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic061852o},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {2459-2470},
peerreviewed = {Yes},
title = {{Water} exchange on seven-coordinate {Mn}({II}) complexes with macrocyclic pentadentate ligands: {Insight} in the mechanism of {Mn}({II}) {SOD} mimetics},
volume = {46},
year = {2007}
}
@article{faucris.121239844,
abstract = {Water exchange on a molecular, purely inorganic cobalt-based water oxidation catalyst, [Co (H O) (α-P W O ) ] (1), in the catalytically relevant pH region (pH 6-10) is studied using O-NMR spectroscopy and ultrahigh-resolution electrospray ionization mass spectrometry. The results are compared with those of the inactive [Co (H O) Si W O ] (2), which is stable in the same pH region. The results obtained provide mechanistic details of the elementary reaction step related to the water oxidation on homogeneous metal oxide catalysts under catalytically relevant conditions. It is shown that the structural integrity of 1 and 2 is maintained, no deprotonation of the aqua ligands on the Co(II) centers occurs, and the water exchange does not undergo any mechanistic changeover at the catalytic pH conditions. We have demonstrated that the water exchange process is influenced by the cluster environment surrounding the water binding sites and is fast enough to not be rate-limiting for the water oxidation catalysis. © 2011 American Chemical Society.},
author = {Lieb, Dominik and Zahl, Achim and Wilson, Elizabeth Frances and Streb, Carsten and Nye, Leanne and Meyer, Karsten and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic201243n},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {9053-9058},
peerreviewed = {Yes},
title = {{Water} exchange reactivity and stability of cobalt polyoxometalates under catalytically relevant {pH} conditions: {Insight} into water oxidation catalysis},
volume = {50},
year = {2011}
}
@article{faucris.123304764,
abstract = {New Brønsted acidic ionic liquids (BAILs) are prepared by treating zwitterions, which are composed of an imidazolium cation and a sulfonate anion, with an alkanedisulfonic acid. Acidification of the zwitterions produces the cation and deprotonation of the alkanedisulfonic acid forms the anion of the new BAILs. Direct laser desorption/ionisation (LDI), matrix-assisted LDI (MALDI) and electrospray ionisation (ESI) are employed to transfer ions into the gas-phase for detection by mass spectrometry and for dissociation studies by tandem mass spectrometry. The components of the BAILs are confirmed by LDI and MALDI by the detection of the respective cation and anion and by ESI by the observation of the cation and the dianion. A prominent feature of ESI is the formation of aggregates (cluster ions). Positively charged cluster ions are formally composed of multiple zwitterions plus one additional proton. In the negative-ion mode the clusters also incorporate the zwitterions which are, however, linked with the alkanedisulfonate dianion. In collision-induced dissociations (CID), the cationic aggregates show the evaporation of zwitterions until the protonated zwitterion is reached. Similarly, the cluster dianions release zwitterions until the free alkane disulfonate dianion is reached. However, the 1:1 adduct of dianion and zwitterion also displays proton transfer and Coulomb explosion into the mono-protonated disulfonic mono-anion and an imidazole-based carbene with sulfonate mono-anion. © 2012 the Owner Societies.},
author = {Li, Jing and Nye, Leanne and Schulz, Peter and Wasserscheid, Peter and Ivanovic-Burmazovic, Ivana and Drewello, Thomas and Wei, Wei},
doi = {10.1039/c2cp24071h},
faupublication = {yes},
journal = {Physical Chemistry Chemical Physics},
pages = {5115-5121},
peerreviewed = {Yes},
title = {{Zwitterionic} clusters with dianion core produced by electrospray ionisation of {Brønsted} acidic ionic liquids},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS{\_}CPL&KeyUT=WOS:000301957900011&KeyUID=WOS:000301957900011},
volume = {14},
year = {2012}
}