Abstract

Bimolecular electron transfer reactions of electronically excited rhodium compounds were studied by means of laser photolysis kinetic spectroscopy. Di- and tri-methoxybenzenes and aromatic amines such as diphenylamine, phenylenediamine, and benzidine reduced both π-π * triplet excited state of Rh(4,7-diphenyl-1,10-phenanthroline) 3+ 3 (Rh(dp-phen) 3+ 3), Rh(1,10-phenanthroline) 3+ 3 (Rh(phen) 3+ 3) and ligand field triplet excited states of RhCl 2(dp-phen) 2 and RhCl 2(Phen) + 2 with a high efficiency. Back electron transfer, which takes place within a cage complex formed in the primary electron transfer, is retarded by lack of intermolecular electronic exchange interaction and spin-orbit interaction.

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