UNIGE document Scientific Article
previous document  unige:2967  next document
add to browser collection
Title

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

Authors
Gumy, Jean-Claude
Published in Journal of Physical Chemistry. A. 1997, vol. 101, no. 46, p. 8575-8580
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.
Identifiers
Full text
Structures
Research group Groupe Vauthey
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: Journal of Physical Chemistry. A, 1997, vol. 101, n° 46, p. 8575-8580. https://archive-ouverte.unige.ch/unige:2967

220 hits

0 download

Update

Deposited on : 2009-09-21

Export document
Format :
Citation style :