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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
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
Coumarins |
| Issue Date: | Apr-2006 |
| Publisher: | CSIR |
| IPC Code: | G01J3/28 |
| 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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