Title: Photophysics, photochemistry and kinetics of indolinospiropyran derivatives and an indolinothiospiropyran
Abstract: Three indolinospiropyran derivatives and an indolinothiospiropyran were studied in solution using nanosecond and microsecond laser flash techniques. A fluorescence lifetime was also obtained for the indolinothiospiropyran. All these compounds showed photochromism under laser flash conditions. No triplet transients were observed and oxygen (versus nitrogen) had no effect on the spectra, the kinetics of formation (shorter than 1 ns) or the disappearance (longer than 400 μs) of the colored photoproduct. The transients were in the transoid opened form (merocyanine) existing in several trans conformations coming exclusively from the singlet excited state on the picosecond time scale. No cisoid form was observed down to 1 ns. No evidence of aggregation of the species in hexane was observed in contrast to 6′-nitroindolinospiropyran.
Publication Year: 1986
Publication Date: 1986-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 19
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