Datensatz

Zusammenfassung

Two rigid bischromophoric systems featuring identical donor and acceptor moieties have been studied in order to directly determine the relative importance of through−space and through−bond mechanisms for electron−transfer reactions. The two molecular systems studied have the unique feature that the through−bond distance between any pair of atoms in the two molecules is held constant while the spatial distance between the donor and acceptor is changed. Time−resolved laser measurements reveal that back−electron−transfer dynamics following photoexcitation of the ground−state charge−transfer absorption band are the same in the two systems. The results provide direct evidence for the through−bond mechanism of electron transfer in bridged organic donor−acceptor systems