Full temporal resolution of the two-step photoinduced energy-electron transfer in a fullerene-oligothiophene-fullerene triad using sub-10 fs pump-probe spectroscopy

Citation
Pa. Van Hal et al., Full temporal resolution of the two-step photoinduced energy-electron transfer in a fullerene-oligothiophene-fullerene triad using sub-10 fs pump-probe spectroscopy, CHEM P LETT, 345(1-2), 2001, pp. 33-38
Citations number
24
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
345
Issue
1-2
Year of publication
2001
Pages
33 - 38
Database
ISI
SICI code
0009-2614(20010907)345:1-2<33:FTROTT>2.0.ZU;2-4
Abstract
The intramolecular photoinduced energy and electron transfer in a fullerene -oligothiophene-fullerene triad with nine thiophene units (C-60-9T-C-60) ha s been investigated with sub-10 fs pump-probe spectroscopy in solvents of d ifferent polarity. Photoexcitation of the oligothiophene moiety results in an ultrafast singlet-energy transfer reaction to create the fullerene singl et-excited state with a time constant of 95 fs, irrespective of the polarit y of the medium. In a polar solvent, the ultrafast singlet-energy transfer is followed by intramolecular electron transfer from the oligothiophene to the fullerene with a time constant of 10 ps, resulting in a charge-separate d state (CSS) with a lifetime of 80 ps. (C) 2001 Elsevier Science B.V. All rights reserved.