Energy transfer quenching of a fluorescent excited radical cation by counter radical anion:dissipation of radical ions generated by photoinduced electron transfer

摘要

Fluorescence from the excited 1,3,5-trimethoxybenzene radical cation (MTB~.+*)coexsisting with 1,4-dicyanonaphthalene radical anion (NCN~(.-)) in acetonitrile was studied by the two-step two-laser excitation technique.The fluorescence intensity observed as a function of the delay time of the excitation pulse relative to generation pulse for TMB~(.-) indicated the quenching by DCN~(.-) at <=220 ns.From the analysis of the fluorescence behavior by the Forster-type energy transfer theory,the distance between TMB~(.+*)and DCN(~.-)druing their dissipation after the initial photoinduced electron transfer was estimated as a function of time.