Photoinduced Electron Transfer Reactions of tris(4,4’-dimethoxy-2,2’-bipyridyl)ruthenium(II)cation with Quinones in Aqueous Medium

T. Sumitha Celin, G. Allen Gnana Raj*

Department of Chemistry & Research Centre, Scott Christian College (Autonomous), Nagercoil (affiliated to Manonmaniam Sundaranar University, Tirunelveli), Tamilnadu 629003, India

Adv. Mater. Lett., 2020, 11 (11), 20111575

DOI: 10.5185/amlett.2020.111575

Publication Date (Web): Oct 19, 2020

E-mail: allengraj@gmail.com

Abstract


Photoinduced electron transfer reactions of [Ru(dMeObpy)3]2+ complex with quinones have been studied in  aqueous medium by luminescent quenching technique. The complex shows an absorption and emission maximum of 448 nm and 608 nm respectively in aqueous medium. It has an excited state lifetime of 232 ns. The quenching rate constant kq is sensitive to the nature of the quencher and the electron transfer distance between the luminophore and the quencher, the reduction potential of the quinones. The nature of quenching is confirmed from ground state absorption studies. The oxidative nature of quenching is confirmed from the formation of Ru3+ ion and quinone anion radical. Structural effects also influence the rate of electron transfer reaction.

Keywords

Quinones, luminescence quenching, Stern-Volmer plot, photoinduced electron transfer.

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