SOLVATOCHROMISM AND PROTOTROPISM OF 2-(3'-HYDROXYPHENYL)BENZOXAZOLE AND 2-(4'-HYDROXYPHENYL)BENZOXAZOLE IN THE EXCITED SINGLET-STATE

被引：13

作者：

DEY, JK ^{[1
]}

DOGRA, SK ^{[1
]}

机构：

[1] INDIAN INST TECHNOL,DEPT CHEM,KANPUR 208016,UTTAR PRADESH,INDIA

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1991年 / 59卷 / 03期

关键词：

D O I：

10.1016/1010-6030(91)87083-8

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：

The absorption and fluorescence spectral properties of 2-(3'-hydroxyphenyl)benzoxazole (m-HPBO) and 2-(4'-hydroxyphenyl)benzoxazole (p-HPBO) were studied in a series of organic solvents and in aqueous solutions with H}/pH/H0 in the range 16.0 to -10.4. The Stokes shifts of m-HPBO and p-HPBO, correlated with various polarity scales, suggest that the former molecule is more polar and has a larger dipole moment than the latter in the S1 state. Neutral-zwitterion and monocation-zwitterion equilibria exist in the S1 state of the molecules. The excited state proton transfer reactions of m-HPBO were studied kinetically. The pK(a) values of the different prototropic equilibria in the S0 and S1 states were determined.

引用

页码：307 / 321

页数：15

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