en
Scientific article
English

Investigation of the Excited State Dynamics of Radical Ions in the Condensed Phase Using the Picosecond Transient Grating Technique

Published inThe journal of physical chemistry. A, vol. 101, no. 46, p. 8575-8580
Publication date1997
Abstract

A study of the dynamics of ground-state recovery of the perylene radical cation (Pe•+), of perylene radical anion (Pe•-), and of anthraquinone radical anion (AQ•-) is reported. In boric acid glass, the excited-state lifetime of Pe•+ is 35 ± 3 ps, while in concentrated sulfuric acid, it is smaller than 15 ps, the time resolution of the experimental setup. The excited-state lifetime of Pe•+, Pe•-, and AQ•- generated by photoinduced intermolecular electron-transfer reaction in MeCN is shorter than 15 ps. In the case of Pe•-, the uncomplete ground-state recovery is ascribed to the occurrence of electron photoejection. The free ion yield in the intermolecular electron-transfer reaction between 9,10-dicyanoanthracene (DCA) and two electron acceptors was measured in a two-pulse experiment, where the second pulse excited the ensuing DCA•-. This excitation has no influence on the magnitude of the free ion yield, indicating a short excited-state lifetime of DCA•-* relative to the time scale of back electron transfer and ionic dissociation. A red emission, ascribed to the fluorescence of protonated Pe, was detected in boric acid glass and sulfuric acid. No fluorescence that could be clearly ascribed to Pe•+* could be observed.

Research group
Citation (ISO format)
GUMY, Jean-Claude, VAUTHEY, Eric. Investigation of the Excited State Dynamics of Radical Ions in the Condensed Phase Using the Picosecond Transient Grating Technique. In: The journal of physical chemistry. A, 1997, vol. 101, n° 46, p. 8575–8580. doi: 10.1021/jp972066v
Identifiers
ISSN of the journal1089-5639
604views
0downloads

Technical informations

Creation09/21/2009 4:10:47 PM
First validation09/21/2009 4:10:47 PM
Update time03/14/2023 3:12:37 PM
Status update03/14/2023 3:12:37 PM
Last indexation05/02/2024 11:16:50 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack