The time-resolved stimulated emission of a 7-diethylamino-4-methyl-coumarin dye, Coumarin 102 (C102), was investigated in polar and hydroxylic solvents. Analysis of these spectroscopic measurements using semiempirical solvent polarity scales ( E T (30), Kamlet and Taft) showed that the stabilization of the excited singlet state is mainly governed by dipolar and hydrogen bonding interactions. This particuliar behavior was reflected by a good adequacy between the present measured solvation times and the microscopic (or molecular) relaxation times related to both the Debye relaxation time τ D (dielectric continuum model) and the Kirkwood factor g k, which expresse the degree of short range order in the liquid. These data were compared with the ones obtained for thioxanthone via pump−probe experiments and other data available in the literature.
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Morlet-Savary et al. (2001) studied this question.
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