UNIGE document Scientific Article
previous document  unige:3303  next document
add to browser collection
Title

Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction

Authors
Published in Journal of Physical Chemistry. A. 2006, vol. 110, no. 24, p. 7547-7553
Abstract The ultrafast ground state recovery (GSR) dynamics of the radical cation of perylene, Pe•+, generated upon bimolecular photoinduced electron transfer in acetonitrile, has been investigated using pump−pump−probe spectroscopy. With 1,4-dicyanobenzene as electron acceptor, the free ion yield is substantial and the GSR dynamics of Pe•+ was found to depend on the time delay between the first and second pump pulses, Δt12, i.e., on the "age" of the ion. At short Δt12, the GSR dynamics is biphasic, and at Δt12 larger than about500 ps, it becomes exponential with a time constant around 3 ps. With trans-1,2-dicyanoethylene as acceptor, the free ion yield is essentially zero and the GSR dynamics of Pe•+ remains biphasic independently of Δt12. The change of dynamics observed with 1,4-dicyanobenzene is ascribed to the transition from paired to free solvated ion, because in the pair, the excited ion has an additional decay channel to the ground state, i.e., charge recombination followed by charge separation. The rate constants deduced from the analysis of these GSR dynamics are all fully consistent with this hypothesis.
Identifiers
Full text
Structures
Research group Groupe Vauthey
Citation
(ISO format)
PAGES, Stéphane, LANG, Bernhard Felix, VAUTHEY, Eric. Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction. In: Journal of Physical Chemistry. A, 2006, vol. 110, n° 24, p. 7547-7553. https://archive-ouverte.unige.ch/unige:3303

179 hits

665 downloads

Update

Deposited on : 2009-09-21

Export document
Format :
Citation style :