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- Title
Photoluminescence electron transfer quenching of ruthenium(II)-polypyridyl complexes with biologically important phenolate ions in aqueous acetonitrile solution.
- Authors
Daniel, Sheeba; George, Allen
- Abstract
The photoinduced electron transfer reactions of three Ru(II) complexes with phenolate ions of polyphenols (gallic acid, quercetin, p-coumaric acid, and ferulic acid) and thymol have been measured in 50 % aqueous acetonitrile at pH 11 and the observed quenching constant ( k) values are sensitive to the nature of the ligand and the structure of the phenolate ion. The change of k values with Δ G is in accordance with the Marcus semiclassical theory of electron transfer. The static as well as dynamic nature of quenching is confirmed from the ground-state absorption studies. The reductive quenching of the Ru(II) complexes by the phenolate ions has been confirmed from the transient absorption spectra. The formation of phenoxyl radical as a transient is confirmed by its characteristic absorption at 400 nm. Graphical abstract: [Figure not available: see fulltext.]
- Subjects
RUTHENIUM compounds; PHOTOINDUCED electron transfer; POLYPYRIDINES; PHENOXIDES; ACETONITRILE synthesis; QUENCHING (Chemistry); MARCUS equation; ACETONITRILE
- Publication
Journal of the Iranian Chemical Society, 2015, Vol 12, Issue 4, p695
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-014-0528-1