MECHANISM AND KINETICS OF PROTON-TRANSFER REACTION IN EXCITED INTERNALLY HYDROGEN-BONDED BENZOXAZOLE DERIVATIVES AS STUDIED BY PICOSECOND TRANSIENT ABSORPTION AND STIMULATED-EMISSION PUMPING

被引：35

作者：

GRABOWSKA, A ^{[1
]}

SEPIOL, J ^{[1
]}

RULLIERE, C ^{[1
]}

机构：

[1] UNIV BORDEAUX 1, CTR PHYS MOLEC OPT & HERZIENNE, CNRS, UA 283, F-33405 TALENCE, FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 25期

关键词：

D O I：

10.1021/j100178a041

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：

Dually fluorescent molecules 2,5-bis(benzoxazolyl)hydroquinone and 3,6-bis(benzoxazolyl)pyrocatechol undergo the excited-state intramolecular single and double proton transfer, respectively. Both together with a model compound, 2,5-bis(benzoxazolyl)-4-methoxyphenol, reveal transient absorption and gain bands detected with a picosecond temporal resolution. Gain bands found in the spectral range of the phototautomeric fluorescence served as a guide for the application of the stimulated emission pumping (SEP): radiation resonant with the phototautomeric emission depopulates the corresponding energy level. This effect is followed exactly by the primary (blue) fluorescence. The result confirms the existence of the equilibria in S1 states of both molecules and shows the new application of SEP technique.

引用

页码：10493 / 10495

页数：3

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