Primary ultrafast events preceding the photoinduced proton transfer from pyranine to water

被引:186
作者
Tran-Thi, TH
Gustavsson, T
Prayer, C
Pommeret, S
Hynes, JT
机构
[1] CEA Saclay, SPAM, DRECAM, DSM, F-91191 Gif Sur Yvette, France
[2] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
[3] Ecole Normale Super, CNRS UMR 8640, Dept Chim, F-75231 Paris, France
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0009-2614(00)01037-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Femtosecond fluorescence and absorption spectroscopies are used to probe the early events of the photoinduced proton transfer (PT) from pyranine to water. The process is found to involve two ultrafast steps (300 fs and 2.5 ps) which precede the relatively slow (87 ps) PT step. From the comparative study of the properties of the excited acid and its conjugate anion in various aqueous and alcoholic media, these ultrafast steps are identified as the solvation dynamics of the locally excited (LE) state of the acid and its subsequent relaxation to an intermediate electronic state, whose nature is discussed. (C) 2000 Elsevier Science B.V, All rights reserved.
引用
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页码:421 / 430
页数:10
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