en
Scientific article
Open access
English

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

Published inThe journal of physical chemistry. A, vol. 110, no. 24, p. 7547-7553
Publication date2006
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.

Research group
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: The journal of physical chemistry. A, 2006, vol. 110, n° 24, p. 7547–7553. doi: 10.1021/jp0615252
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal1089-5639
550views
878downloads

Technical informations

Creation09/21/2009 4:22:58 PM
First validation09/21/2009 4:22:58 PM
Update time03/14/2023 3:14:18 PM
Status update03/14/2023 3:14:18 PM
Last indexation05/02/2024 11:18:23 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack