Abstract
Competition between electron transfer via a through σ-bond and a through π-bond mechanism has been studied in 1-(4-cyanophenyl)-4-(cyanomethylene)piperidine. In this trichromophoric system designed in a configuration acceptor−donor−acceptor, where the donor chromophore is part of the initially excited state, electron transfer occurs in two directions. The results of the single-photon-timing measurements indicate that, in both diethyl ether and acetonitrile, two charge-transfer states, a σCT and a πCT state, are formed, by transferring the electron through the σ- or π-bonds, respectively. Information on the excited-state kinetics is obtained by means of global compartmental analysis of the fluorescence decay surface in acetonitrile. Both the σCT and πCT state are formed immediately upon excitation, within the time resolution of the experimental setup, and an electron exchange between the two polar states occurs at least in one direction.
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