Photoinduced electron transfer between C60 and N,N,N′,N′-tetramethylbenzidine (NTMB). Fourier transform electron paramagnetic resonance study

Fourier transform EPR spectroscopy was employed in studying the electron transfer (ET) reaction and the quenching mechanisms of the photoexcited triplet state of C60 as electron acceptor and N,N,N′,N′-tetramethylbenzidine (NTMB) as electron donor in benzonitrile solution. The ET reaction product, the cation radical NTMB*+, interacts with 3*C60, leading to photoinduced electron polarization of NTMB*+ via triplet-doublet mixing mechanism combined with triplet mechanism. The quenching of 3*C60 and the polarization behavior of NTMB*+ are discussed.