Effect of Oxygen on Photoinduced Electron Transfer Reactions of Ru(II) Polypyridyl Complex with Quinones in 50% Aqueous Acetonitrile and Aqueous Medium

Abstract

Photoinduced electron transfer reactions of [Ru(dmbpy)₃]²⁺ complex with quinones in 50% acetonitrile  and aqueous medium were studied. The complex shows an absorption maximum at 459 nm in 50% aqueous acetonitrile medium and an emission maximum at 605 nm. Emission spectrum were taken for aerated and deaerated sample solutions .The quenching rate constant  k_q depends on the nature of the quencher, ligand and also on the nature of the solvent used. Stern-Volmer analysis has been used to find out the quenching rate constant. The results show that molecular oxygen plays an important role with the excited state of the *[Ru(dmbpy)₃]²⁺.