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 q) values are sensitive to the nature of the ligand and the structure of the phenolate ion. The change of k q values with ΔG 0 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.
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