期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 889, 期 1-3, 页码 383-393出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2008.02.020
关键词
Binary solvent; Stokes shift; Solvatochromic shift; Dipole moment; Lifetime
资金
- UGC, New Delhi, India
- CSIR, New Delhi
- Council of Scientific and Industrial Research
Absorption and fluorescence spectra of four coumarin laser dyes, Coumarin 440 (C440), Coumarin 450 (C450), Coumarin 466 (C466) and Coumarin 151 (C151), have been recorded in binary mixtures of DMSO and water at room temperature (298 K) to study the solvent effect and to evaluate the ground and excited state dipole moments using solvatochromic shift method. The anomalous feature in the complex systems of these mixtures due to the structural heterogeneities is discussed. The effect of solvent polarity parameters of binary mixture on the ground and excited state dipole moments was examined. Experimental results indicate that the dipole moments in the excited state, for all the molecules investigated, are higher than the corresponding values in the ground state. The ground and excited state dipole moments of these probes have also been computed from ab initio calculations and compared with those obtained experimentally. Fluorescence lifetimes of all the probes measured using time domain fluorescence spectrometer employing time correlated single photon counting technique, show a nonlinear variation with the composition of binary mixture. (C) 2008 Elsevier B.V. All rights reserved.
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