Light-induced electron transfer reactions

Abstract

The reactions of the luminescent excited states of the polypyridine-ruthenium(II) complexes ( *RuL 3 2+) with electron acceptors and donors are discussed. These electron transfer reactions convert the excited state into RuL 3 3+ and RuL 3 +, respectively. The former ruthenium complex is a more powerful oxidant and the latter is a more powerful reductant than the excited state itself. Some applications of these complexes in the conversion and storage of solar energy are presented. Theoretical models for electron transfer reactions are described and the implications of these models for the quenching and back electron transfer reactions are discussed. It is pointed out that the exploitation of the inverted region may provide a useful means of slowing down back electron transfer reactions.