Spectroscopy and photophysics of 1-phenylisatin and oxindole

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...

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Bibliographic Details
Published in:Optical materials 2000-11, Vol.15 (2), p.131-141
Main Authors: Bangal, Prakriti Ranjan, Chakravorti, Sankar
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence spectra
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Fundamental areas of phenomenology (including applications)
Laser materials
Molecular properties and interactions with photons
Molecular spectra
Optical materials
Optics
Physics
Ultraviolet spectra
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Summary: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.
ISSN:0925-3467
1873-1252
DOI:10.1016/S0925-3467(00)00011-2