Pressure effect on photo-induced electron-transfer reactions between tris-(2,2′-bipyridine)ruthenium(II) and various metal complex ions

Abstract

The electron-transfer quenching of photo-excited [Ru(bpy)32+](bpy = 2,2′-bipyridine) by [Mo(CN)8]4– and Euaq2+ gives large positive and negative activation volumes (ΔV‡+ 24.7 and –11.0 cm3 mol–1), respectively, whereas quenching by other quenchers having quenching rate constants of > 109 mol–1 dm3 s–1 has a negligibly small pressure effect regardless of the charge of quencher.