Pevny, Florian and Winter, Rainer F. and Sarkar, Biprajit and Zalis, Stanislav (2010) How to elucidate and control the redox sequence in vinylbenzoate and vinylpyridine bridged diruthenium complexes. DALTON TRANSACTIONS, 39 (34). pp. 8000-8011. ISSN 1477-9226,
Full text not available from this repository.Abstract
Vinylbenzoate-bridged diruthenium complexes (RHC=CH)(CO)(P(i)Pr(3))(2)Ru(mu-4-OOCC(6)H(4)-CH=CH)-RuCl(CO)(P(i)Pr(3))(2) (R = Ph, 3a or CF(3), 3b) and vinylpyridine-bridged (eta(6)-p-cymene)Cl(2)Ru(mu-NC(5)H(4)-4-CH=CH)RuCl(CO)(P(i)Pr(3))(2) (3c) have been prepared from their monoruthenium precursors and investigated with respect to the sequence of the individual redox steps and electron delocalization in their partially and fully oxidized states. Identification of the primary redox sites rests on the trends in redox potentials and the EPR, IR and Vis/NIR signatures of the oxidized radical cations and is correctly reproduced by quantum chemical investigations. Our results indicate that the trifluoropropenyl complex 3b has an inverse FMO level ordering (Ru1-bridge-Ru2 > terminal vinyl-Ru1 site) when compared to its styryl substituted counterpart 3a such that the primary oxidation site in these systems can be tuned by the choice of the terminal alkenyl ligand. It is further shown that the vinylbenzoate bridge is inferior to the vinylpyridine one with regard to charge and spin delocalization at the radical cation level. According to quantum chemical calculations, the doubly oxidized forms of these complexes have triplet diradical ground states and feature two interconnected oxidized vinyl ruthenium subunits.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ORDER REGULAR APPROXIMATION; DENSITY-FUNCTIONAL CALCULATIONS; RUTHENIUM(II) COMPLEXES; INSERTION REACTIONS; ELECTRON-TRANSFER; LIGANDS; OXIDATION; ENERGY; VINYL; PARAMETERS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Arbeitskreis Prof. Dr. Rainer Winter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Aug 2020 06:16 |
| Last Modified: | 17 Aug 2020 06:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25424 |
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