European Journal of Chemistry

Determination of excited singlet-state dipole moments of hydroxy and methoxy coumarins using solvatochromic method



Main Article Content

Mohd Mudassir Husain
Rajeev Sindhu
Harmesh Chander Tandon

Abstract

The effects of solvents of various polarity on the electronic absorption and fluorescence spectra of 7-hydroxy-4-trifluoromethyl coumarin; 6,7-dihydroxy-4-trifluoromethyl coumarin and 7-methoxy-4-trifluoromethyl coumarin have been investigated. The singlet-state excited dipole moments (μe) and ground state dipole moments (μg) are estimated from Bakshiev and Kawski-Chamma-Viallet equations by using the variation of Stokes’ shift with the solvent’s dielectric constant (ε) and refractive index (n). The observed singlet-state excited dipole moments are found to be larger than the ground-state ones. In addition, the geometry and other electronic properties are computed using ab-initio method with correlation functions at 6-31G basis set.

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Husain, M. M.; Sindhu, R.; Tandon, H. C. Determination of Excited Singlet-State Dipole Moments of Hydroxy and Methoxy Coumarins Using Solvatochromic Method. Eur. J. Chem. 2012, 3, 75-80.

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