Electron Transfer Reaction to Triplet Excited State of Fullerenes in Solution

Comparis on with the Rehm-Weller Equation

Abstract

Quenching rate constants (kq) of triplet C₇₀ by electron donors have been measured by laser flash spectroscopy in benzonitrile and acetonitrile-benzene (1: 4). A plot of kq values versus free energy change for the electron transfer to ³C₇₀ gives a fairly good correlation with rate constants calculated from the Rehm-Weller equation if corrected the diffusioncontrolled rates in the solvents used. The quenching rate constants of the triplet C₇₀ were fairly similar to those of triplet C₆₀ reported by Foote et al., and the coincidences of the rate constants can be ascribed to the practically same values of their triplet energies and reduction potentials between C₆₀ and C₇₀.