Photoinduced multistep energy and electron transfer in an oligoaniline-oligo(p-phenylene vinylene)-fullerene triad

A. Marcos Ramos, S.C.J. Meskers, P.A. Hal, van, J. Knol, J.C. Hummelen, R.A.J. Janssen

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Abstract

A donor-donor-acceptor triad, OAn-OPV-C60, with a redox gradient has been synthesized by covalently linking an oligoaniline (OAn), an oligo(p-phenylene vinylene) (OPV), and a fullerene (C60) in a nonconjugated linear array. Photoluminescence and femtosecond pump-probe spectroscopy studies reveal that photoexcitation of any of the three chromophores of this triad in a polar solvent results in formation of the OAn-OPV+-C60- charge-sepd. state, after an efficient ultrafast (1 ns) due to weak electronic coupling between the distant redox sites in the excited state. The stabilization gained is more than 1 order of magnitude in time. The exptl. results are found to be in qual. agreement with Marcus theory. In thin films, the OAn+-OPV-C60- state is formed at a higher rate and in higher quantum yield than in soln. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)9269-9283
JournalJournal of Physical Chemistry A
Volume107
Issue number44
DOIs
Publication statusPublished - 2003

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