European Journal of Chemistry

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

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Mohd Mudassir Husain
Rajeev Sindhu
Harmesh Chander Tandon


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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How to Cite
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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Supporting Agencies

Department of Applied Sciences and Humanities, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi, India

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