Photoconducting Properties of Fullerene Derivatized with a Biphenyl Moiety

摘要

The properties of low molecular weight molecules,in which the electron-acceptor fullerene unit was linked by malonate group and flexible long alkyl chains to two biphenyl-phenyl units,were studied.Cyclic voltammetry measurements showed five consecutive one-electron,reversible electro-reductions for the fullerene unit and a single two-electron,reversible electro-oxidation for biphenyl moiety.The two electron process indicated that two biphenyl moieties interacted;presumably folded conformation was formed with two electron donating moieties at close proximity.A long-living charge-separated state induced upon light absorption was confirmed by the ESR spectroscopy studies.These properties were responsible for observed photoconductivity of the studied compound.