Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes.

Journal article


Publication Details

Author(s): Scheerer S, Linseis M, Wuttke E, Weickert S, Drescher M, Tröppner O, Ivanovic-Burmazovic I, Irmler A, Pauly F, Winter RF
Journal: Chemistry - A European Journal
Publisher: Wiley-VCH Verlag
Publication year: 2016
Volume: 22
Journal issue: 28
Pages range: 9574-90
ISSN: 0947-6539
eISSN: 1521-3765


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.



FAU Authors / FAU Editors

Ivanovic-Burmazovic, Ivana Prof. Dr.
Lehrstuhl für Bioanorganische Chemie
Tröppner, Oliver
Lehrstuhl für Bioanorganische Chemie


How to cite

APA:
Scheerer, S., Linseis, M., Wuttke, E., Weickert, S., Drescher, M., Tröppner, O.,... Winter, R.F. (2016). Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes. Chemistry - A European Journal, 22(28), 9574-90. https://dx.doi.org/10.1002/chem.201601384

MLA:
Scheerer, Stefan, et al. "Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes." Chemistry - A European Journal 22.28 (2016): 9574-90.

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Last updated on 2018-16-10 at 10:08