Photoinduced electron transfer between Ru(bpy) 32+ and donor/acceptor in a polyethylene oxide film

Abstract

Electron transfer in a poly(ethylene oxide) (PEO) film has been investigated by the quenching of photoexcited Ru(bpy) 3 2+ by 10-methylphenothiazine (MPTZ) and/or methylviologen (MV 2+) dispersed in the film. Photoinduced electron transfer occurs by both the dynamic and static mechanisms. The electron transfer rate constants and characteristic electron transfer distances were 4.6 × 10 6 M −1 s −1/1.2 nm from MPTZ to Ru(bpy) 3 2+∗ and 1.3 × 10 7 M −1 s −1 /1.7 nm from Ru(bpy) 3 2+∗ to MV 2+ in each system. The diffusion coefficient of the molecules was estimated from the electron transfer rate constant and the electron transfer distance to be the order of 10 −8–10 −9 cm 2 s −1.