Synthesis and Characterization of a Trisheteroleptic Ru-II-Based Molecular Switch
Monczak K, Peuntinger K, Sorsche D, Heinemann FW, Guldi DM, Rau S (2014)
Publication Status: Published
Publication Type: Journal article
Publication year: 2014
Journal
Publisher: WILEY-V C H VERLAG GMBH
Book Volume: 20
Pages Range: 15426-15433
Journal Issue: 47
Abstract
The synthesis of a trisheteroleptic ruthenium complex [Ru(tb)(dppz)(tmbiH(2))][PF6](2) (tb = 4,4'-di-tert-butyl-2,2'-bipyridine, dppz = dipyrido[3,2-a:2',3'-c]phenazin, tmbiH(2) = 5,6,5',6'-tetramethyl-2,2'-bibenzimidazole) is described. In addition, the structural characterisation by means of 1D, 2D H-1 NMR spectroscopy, and mass spectrometry, along with determination of the solid-state structure of the important precursor Ru(tb)(dppz) Cl-2, supports the proposed octahedral coordination geometry. The capability of tmbiH(2) to form hydrogen bonds is corroborated by the solid-state structure. The photochemical characteristics of this complex can be described as a combination of the "light switch" effects, which are either attributed to the dppz or to the tmbiH(2) ligand. To illustrate the molecule's double switchable features, steady-state absorption and emission measurements were performed, which include the determination of the quantum yield and the pK(a) values of the acidic protons of the tmbiH(2) ligand. Notably, the emission lifetimes are sensitive to the solvents used. This phenomenon is due to a proton-coupled deactivation of the excited metal-to-ligand charge transfer (MLCT) state of the complex.
Authors with CRIS profile
Katrin Peuntinger
Lehrstuhl für Physikalische Chemie I
Frank Wilhelm Heinemann
Lehrstuhl für Anorganische und Allgemeine Chemie
Dirk Michael Guldi
Lehrstuhl für Physikalische Chemie I
Involved external institutions
Germany (DE)How to cite
APA:
Monczak, K., Peuntinger, K., Sorsche, D., Heinemann, F.W., Guldi, D.M., & Rau, S. (2014). Synthesis and Characterization of a Trisheteroleptic Ru-II-Based Molecular Switch. Chemistry - A European Journal, 20(47), 15426-15433. https://dx.doi.org/10.1002/chem.201403418
MLA:
Monczak, Katharina, et al. "Synthesis and Characterization of a Trisheteroleptic Ru-II-Based Molecular Switch." Chemistry - A European Journal 20.47 (2014): 15426-15433.
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