Charge transfer from donor to photoexcited Ru(bpy)(3)(2+) in solution and polymer matrix

Electron transfer quenching of photoexcited Ru(bpy)(3)(2+) (bpy, bipyridine) by three kinds of hole transport material, phenothiazine (PTZ) and 10-methylphenothiazine (MPTZ) was studied in acetonitrile solution and a polymer film. The quenching rate constants (k(q)) with respect to Delta G in acetonitrile solution are discussed in terms of Marcus theory. In poly(ethyleneoxide) (PEG) films, quenching of photoexcited Ru(bpy)(3)(2+) was observed and analysed by a static quenching model. The electron transfer distance in the polymer film was found to be 1.1-1.9 nm using a modified Perrin equation considering the excluded volume effect. The dependence of the electron transfer rate on Delta G in the PEO film was larger than that in acetonitrile solution.