BINARY SOLVENT EFFECTS ON THE ABSORPTION AND EMISSION OF 7-AMINOCOUMARINS

被引：25

作者：

ARBELOA, TL ^{[1
]}

ARBELOA, FL ^{[1
]}

ESTEVEZ, MJT ^{[1
]}

ARBELOA, IL ^{[1
]}

机构：

[1] UNIV BASQUE COUNTRY, EHU, FAC CIENCIAS, DEPT QUIM FIS, E-48080 BILBAO, SPAIN

来源：

JOURNAL OF LUMINESCENCE | 1994年 / 59卷 / 06期

关键词：

D O I：

10.1016/0022-2313(94)90064-7

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photophysical properties of di-, mono- and non-ethyl 7-aminocoumarins have been investigated in different water/ethanol mixtures. The effect of the solvent composition on the spectral shifts and on the radiationless deactivation process depends on the molecular structure of the dye. The solvent effect is analyzed in terms of hydrogen bondings between the dye and protic solvents. The mechanism for internal conversion is discussed by two models: via a twisted intramolecular charge transfer (TICT) state, and by an hybridational change of the amino group (open-close umbrella-like motion, ULM model). Both models can explain the experimental results if solute-solvent hydrogen bonds are considered.

引用

页码：369 / 375

页数：7

共 31 条

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