Two-step mechanism for the photoinduced intramolecular electron transfer in oligo(p-phenylene vinylene)-fullerene dyads

P.A. van Hal, R.A.J. Janssen, G. Lanzani, G. Cerullo, M. Zavelani-Rossi, S. De Silvestri

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51 Citations (Scopus)

Abstract

The intramolecular photoinduced charge separation within two oligo(p-phenylene vinylene) fulleropyrrolidine dyads with three and four phenyl rings (OPV3-C60 and OPV4-C60) is investigated with femtosecond pump-probe spectroscopy in solvents of different polarity. Photoexcitation of the OPV moiety of these dyads results in an ultrafast singlet-energy transfer reaction to create the fullerene singlet excited state with a time constant of 190 fs, irrespective of the polarity of the medium. In a polar solvent, intramolecular electron transfer occurs from the OPV moiety to the C60 moiety with a time constant of 10-13 ps as a secondary reaction, subsequent to the ultrafast singlet-energy transfer. The charge-separated state has a lifetime of 50-90 ps and recombines to the ground state.

Original languageEnglish
Article number075206
Pages (from-to)752061-752067
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number7
DOIs
Publication statusPublished - 15 Aug 2001

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