European Journal of Chemistry 2012, 3(1), 87-93 | doi: | Get rights and content


Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra

Mohd Mudassir Husain (1,*) , Rajeev Sindhu (2) , Harmesh Chander Tandon (3)

(1) Physics Section, Department of Applied Sciences and Humanities, Faculty of Engineering and Technology, Jamia Millia Islamia, a Central University, New Delhi-110025, India
(2) New Green Field College of Engineering and Technology, Palwal, Haryana-121102, India
(3) Department of Chemistry, Sri Venketswara College, Delhi University, New Delhi-110021, India
(*) Corresponding Author

Received: 05 Sep 2011 | Revised: 30 Oct 2011 | Accepted: 24 Oct 2011 | Published: 31 Mar 2012 | Issue Date: March 2012


In the present work, the effect of solvents on absorption and fluorescence spectra and dipole moments (μg, μe) of 7-diethylamino coumarin (7DEAC) and 7-diethylamino-4-methyl coumarin (7DEA4MC) have been studied in different solvents of various polarity at room temperature. The solvents have been selected in a way to cover the full range of intermolecular interactions from non-polar hexane to strongly polar formamide. Using the methods of solvatochromism, the difference in the first excited singlet-state (μe) and ground state (μg) dipole moments was estimated from Lippert-Mataga, Bakhshiev, Kawski-Chamma-Viallet and McRae equations. The Onsager’s cavity radius of the probes has been calculated by AM1 and PM3 quantum chemical calculations and also by a direct relation. The change in dipole moment value (Δμ) was also calculated by using the variation of Stoke’s shift with microscopic solvent polarity parameter (ETN). The calculated dipole moments represent new results, as well as some of the solvatochromic results that were not studied earlier in such large number of solvents. It is observed that the values of excited singlet-state dipole moments are higher than the ground state ones in both the molecules, which shows that excited states are more polar than the ground states.



Coumarins; Absorption; Stoke’s shift; Fluorescence; Dipole moment; Onsager’s cavity radius

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DOI: 10.5155/eurjchem.3.1.87-93.519

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Funding information

University Grant Commission, (F. No. 36-360/2008), Jamia Millia Islamia, New Delhi, India.



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How to cite

Husain, M.; Sindhu, R.; Tandon, H. Eur. J. Chem. 2012, 3(1), 87-93. doi:10.5155/eurjchem.3.1.87-93.519
Husain, M.; Sindhu, R.; Tandon, H. Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra. Eur. J. Chem. 2012, 3(1), 87-93. doi:10.5155/eurjchem.3.1.87-93.519
Husain, M., Sindhu, R., & Tandon, H. (2012). Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra. European Journal of Chemistry, 3(1), 87-93. doi:10.5155/eurjchem.3.1.87-93.519
Husain, Mohd, Rajeev Sindhu, & Harmesh Chander Tandon. "Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra." European Journal of Chemistry [Online], 3.1 (2012): 87-93. Web. 25 Sep. 2020
Husain, Mohd, Sindhu, Rajeev, AND Tandon, Harmesh. "Photophysical properties and estimation of ground and excited state dipole moments of 7-diethylamino and 7-diethylamino-4-methyl coumarin dyes from absorption and emission spectra" European Journal of Chemistry [Online], Volume 3 Number 1 (31 March 2012)

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