Fast time-resolved IR studies of the excited states of co-ordination compound: direct observation of intramolecular charge transfer

Abstract

Fast time-resolved IR (TRIR) spectroscopy is used to record ν(C–O) bands of the lowest lying excited state of [ClRe(CO)₃(4,4′-bipyridyl)₂](half-life of approximately 1 µs in CH₂Cl₂ solution); there is a shift of the ν(C–O) bands to higher frequency relative to the ground state, which is consistent with oxidation of the metal centre via electron transfer to the bipyridyl ligands.