Slow excited state injection and charge recombination at star-shaped ruthenium polypyridyl compounds—TiO2 interfaces

Abstract

The excited states of two star-shaped nanometre-sized ruthenium polypyridyl compounds were largely unchanged when anchored to nanocrystalline TiO₂ thin films due to a highly symmetrical and rigid ligand structure that isolated the chromophoric core from the semiconductor. Interfacial electron transfer occurred on unusually slow time scales.