Abstract
The absorption and photoluminescence characteristics of 1-phenylisatin (PI) and oxindole (OI) were studied in different solvents at 300 K. In the basic solution a new absorption band system found for PI has been attributed to a structural change leading to formation of new species. Dual fluorescence for PI and OI in different solvents was explained as normal 1B 2u → 1A 1g transition and the other well-structured band as an anomalous band. This large Stokes shifted anomalous band of PI in water and alcohol was explained as fluorescence emission from a state formed due to solute–solvent relaxation producing a sort of critical inversion. Studies in different solvents including a β-cyclodextrin solution revealed that in suitable active medium PI has all the properties to be potential laser dye.
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