Solvent effects on the absorption and fluorescence spectra of coumarins 6 and 7 molecules: Determination of ground and excited state dipole moment

被引：137

作者：

Raikar, U. S. ^{[1
]}

Renuka, C. G.

Nadaf, Y. F.

Mulimani, B. G.

Karguppikar, A. M.

Soudagar, M. K.

机构：

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

[2] Shivaji Univ, Dept Phys, Kolhapur 416004, Maharashtra, India

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2006年 / 65卷 / 3-4期

关键词：

solventeffect; fluorescence lifetime; dipole moments; coumarin dyes; solvatochromic shift;

D O I：

10.1016/j.saa.2005.12.028

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Absorption and fluorescence emission spectra of coumarins 6 and 7 were recorded in solvents with different solvent parameters, viz., dielectric constant c and refractive index n. The fluorescence lifetime of these dyes were measured in butanol at higher values of viscosity over temperature. Experimental ground and excited state dipole moments are determined by means of solvatochrornic shift method and also the excited state dipole moments are determined in combination with ground state dipole moments. It was determined that dipole moments of the excited state were higher than those of the ground state in both the molecules. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：673 / 677

页数：5

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