European Journal of Chemistry 2012, 3(1), 75-80. doi:10.5155/eurjchem.3.1.75-80.498

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


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: 02 Aug 2011, Accepted: 12 Aug 2011, Published: 31 Mar 2012

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.

3_1_75_80_800


Keywords


Coumarins; Absorption; Stokes’ shift; Fluorescence; Dipole moment; Solvatochromic

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DOI: 10.5155/eurjchem.3.1.75-80.498

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How to cite


Husain, M.; Sindhu, R.; Tandon, H. Eur. J. Chem. 2012, 3(1), 75-80. doi:10.5155/eurjchem.3.1.75-80.498
Husain, M.; Sindhu, R.; Tandon, H. Determination of excited singlet-state dipole moments of hydroxy and methoxy coumarins using solvatochromic method. Eur. J. Chem. 2012, 3(1), 75-80. doi:10.5155/eurjchem.3.1.75-80.498
Husain, M., Sindhu, R., & Tandon, H. (2012). Determination of excited singlet-state dipole moments of hydroxy and methoxy coumarins using solvatochromic method. European Journal of Chemistry, 3(1), 75-80. doi:10.5155/eurjchem.3.1.75-80.498
Husain, Mohd, Rajeev Sindhu, & Harmesh Chander Tandon. "Determination of excited singlet-state dipole moments of hydroxy and methoxy coumarins using solvatochromic method." European Journal of Chemistry [Online], 3.1 (2012): 75-80. Web. 21 Sep. 2019
Husain, Mohd, Sindhu, Rajeev, AND Tandon, Harmesh. "Determination of excited singlet-state dipole moments of hydroxy and methoxy coumarins using solvatochromic method" European Journal of Chemistry [Online], Volume 3 Number 1 (31 March 2012)

DOI Link: https://doi.org/10.5155/eurjchem.3.1.75-80.498

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