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 language | English |
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Article number | 075206 |
Pages (from-to) | 752061-752067 |
Number of pages | 7 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 64 |
Issue number | 7 |
DOIs | |
Publication status | Published - 15 Aug 2001 |