Abstract
The effect of the solvent on the excited state photophysics of two ketocyanine dyes was examined by studying the lifetime () of the S 1 state in the picosecond domain. The overall luminescence decay constant (1/Gt) shows a linear correlation with the polarity parameter E T(30) in neat solvents. The radiative decay constant is practically independent of solvation, whereas the radiationless deactivation constant is sensitive to solvation; this has been attributed to hydrogen bond interaction of the solute carbonyl oxygen with the solvent. Preferential solvation by the protic component occurs in protic-aprotic binary mixed solvents. The influence of the solute-solvent interaction parameters and solvent non-ideality in determining the preferential solvation characteristics has been examined.
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