Solvent effect on photoinduced electron transfer between C60 and 3,3′,5,5′-tetramethylbenzidine studied by nanosecond laser photolysis

Yoshiko Sasaki, Yuko Yoshikawa, Akira Watanabe, Osamu Ito

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    60 Citations (Scopus)

    Abstract

    Photoinduced electron transfer from 3,3′,5,5′-tetramethylbenzidine (TMB) to C60 in polar and non-polar solvents has been investigated by nanosecond (ns) laser photolysis in the visible and near-IR regions. The transient absorption bands of triplet C60 (TC60*), the C60 radical anion (C60.-) and the TMB radical cation (TMB.+) were observed in both non-polar and polar solvents. The rate constants of electron transfer from TC60* to TMB, which were evaluated from the decay of TC60* and growths of TMB.+ and C60.-, decrease with increasing solvent polarity. In non-polar solvents, TMB.+ and C60.- seem to be produced immediately after the ns laser excitation at the same time as the formation of TC60*, suggesting a weak interaction between C60 and TMB, before electron transfer. On decreasing the solvent polarity, the kinetics of the back-electron-transfer reaction from C60.- to TMB.+ change from second-order to first-order, indicating that C60.- and TMB.+ exist as ion pairs in non-polar and less-polar solvents. The back-electron-transfer rates also tend to decrease with the solvent polarity.

    Original languageEnglish
    Pages (from-to)2287-2290
    Number of pages4
    JournalJournal of the Chemical Society, Faraday Transactions
    Volume91
    Issue number15
    DOIs
    Publication statusPublished - 1995 Dec 1

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry

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