Photoinduced Intramolecular Electron Transfer of Carbazole Trimer-[60]Fullerene Studied by Laser Flash Photolysis Techniques

Photoinduced intramolecular events of newly synthesized bis(carbazole trimer)-C 60 adducts have been studied by laser flash photolysis techniques in polar and nonpolar solvents. For bis( tert -butyl-substituted carbazole trimer)-C 60 adduct, charge separation takes place via the excited singlet state of the C 60 moiety in polar solvents as revealed by the combination of the C 60 -fluorescence quenching and transient absorptions of the radical ion pair. On the other hand, for bis(nonsubstituted carbazole trimer)-C 60 adduct, although charge separation takes place, the charge recombination is fast because of the lower electron-donor ability.