Solvent effect on absorption and fluorescence spectra of coumarin laser dyes: Evaluation of ground and excited state dipole moments

被引：107

作者：

Mannekutla, J. R. ^{[1
]}

Mulimani, B. G. ^{[1
]}

Inamdar, S. R. ^{[1
]}

机构：

[1] Karnatak Univ, Dept Phys, Laser Spectroscopy Programme, Dharwad 580003, Karnataka, India

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2008年 / 69卷 / 02期

关键词：

ground and excited state dipole moment; coumarin; solvatochromic; stokes shift;

D O I：

10.1016/j.saa.2007.04.016

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The effect of solvents on absorption and fluorescence spectra and dipole moments of coumarin 307 (C307) and coumarin 522B (C522B) have been studied extensively in various solvents, viz., general solvents, alcohols and binary mixtures (acetonitrile-benzene) at 298 K. The bathchromic shift observed in absorption and fluorescence spectra of C307 and C522B with increasing solvent polarity indicates that transition involved are pi -> pi*. Solvatochromic correlations were used to obtain the ground and excited state dipole moments. The excited state dipole moments are observed to be greater than their ground state counterparts in all the solvents studied. Further, the experimentally obtained Delta mu were compared with those using normalized polarity terms E-T(N) from Reichardt equation. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：419 / 426

页数：8

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