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IJPAP Vol.44(04) [April 2006] >

Title: Steady-state absorption and fluorescence study: Dipole moments of coumarins
Authors: Chandrasekhar, K
Naik, L R
Kumar, H M Suresh
Math, N N
Keywords: Dipole moments
Fluorescence spectra
Absorption spectra
Issue Date: Apr-2006
Publisher: CSIR
IPC CodeG01J3/28
Abstract: The absorption and fluorescence spectra of 7-dimethylamino cyclopenta [c] coumarin (C138) and 4-methyl-piperidino [g] coumarin (C339) dyes were measured in neutral, aprotic and protic solvents. Solvatochromic shifts of absorption and fluorescence as a function of different solvent polarity parameters (bulk as well as microscopic) were analyzed for these dyes and the ground state dipole moment ( g) and the first excited singlet state dipole moment ( e) were estimated to be g = 2.2 and 3.42 D and e = 4.58 and 5.2 D, respectively, for C138 and C339. The dipole moment values of g = 3.4 D and g = 3.8 D were also obtained for C138 and C339 respectively from ab- initio calculations. The results are compared and discussed.
Page(s): 292-299
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(04) [April 2006]

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