Electron Transfer from the Singlet and Triplet Excited States of Ru(dcbpy)2(NCS)2 into Nanocrystalline TiO2 Thin Films

摘要: Time-resolved absorption spectroscopy was used to study the femtosecond and picosecond time scale electron injection from excited singlet triplet states of Ru(dcbpY)(2)(NCS)(2) (RuN3) into titanium dioxide (TiO2) nanocrystalline particle film in acetonitrile. The fastest resolved constant similar to30 fs shown reflect a sum two parallel ultrafast processes, nonergodic transfer (ET) initially state RuN3 conduction band TiO2 intersystem crossing (ISC). branching ratio 1.5 between competing processes gives rate constants 1/50 fs(-1) for ET 1/75 ISC. Following minor part (40%) occurs thermalized on scale. kinetics this slower phase is nonexponential can be fitted with ranging to1 to60 ps.