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Abstract
Properties of the 3 (π,π * ) states of 2-(2'-hydroxyphenyl)benzothiazole (HBT) and 2-(2'-hydroxyphenyl)-benzoxazole (HBO) were investigated by means of transient absorption spectroscopy and ab initio calculations. When the volume fraction of ethanol in a mixed solvent of toluene and ethanol is small, the intramolecularly proton-transferred cis-keto form of HBT predominates over the intermolecularly hydrogen-bonded trans-enol form in the triplet state. However, when the volume fraction of ethanol becomes large, the relative composition is reversed. The triplet species of HBO at 10 μs after photoexcitation contain a cis-enol form in both nonpolar and alcoholic solvents
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