DIRECT OBSERVATION OF FAST PROTON-TRANSFER - FEMTOSECOND PHOTOPHYSICS OF 3-HYDROXYFLAVONE

被引：280

作者：

SCHWARTZ, BJ ^{[1
]}

PETEANU, LA ^{[1
]}

HARRIS, CB ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 09期

关键词：

D O I：

10.1021/j100188a009

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：

We report the first investigation of the fast excited-state intramolecular proton transfer of 3-hydroxyflavone. Picosecond stimulated emission and transient absorption spectroscopy demonstrate that the tautomer formation can be monitored by 620-nm transient absorption. The excited-state proton transfer was studied at 620 nm with femtosecond time resolution, and determined to be 240 +/- 50 fs in a nonpolar solvent environment. The fast excited-state proton transfer in methanol solution, however, was faster than the 125-fs instrument response. A simple model describing the mechanism of the fast excited-state proton transfer of 3-hydroxyflavone in different solvents is presented.

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页码：3591 / 3598

页数：8

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