Abstract
In the studies of binary solvent systems containing non-polar (toluene) and polar proton-donating components (monohydric alcohols) using ketocyanine dyes of 2,5-di-benzylidene-cyclopentanone-1 type as solvent polarity probes, we found that in addition to common solvent polarity-dependent shifts of fluorescence spectra, at low alcohol concentrations there appear two new well-resolved spectral bands. They are attributed to the emission of hydrogen bonded complexes of 1:1 and 1:2 type. Effective constants for hydrogen bond complex formation were estimated for them from the fluorescence titration data.
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