Conclusions
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1.
In the pulsed photoexcitation of a solution of a copolymer of indolinospiropyran with styrene, various stereoisomers of the merocyanine form are formed.
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2.
The proposed scheme of photoconversions of the copolymer includes a step of formation of a cis-cisoid isomer (∼490 nm), which is rapidly converted to three interconvertible stereoisomers with maximum of the absorption bands at ∼560, ∼600, and ∼640 nm.
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3.
The kinetics of dark bleaching at a time >0.1 sec is determined by the decrease in the optical density of the most stable isomer with λmax ≈ 600 nm.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2489–2492, November, 1975.
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Merkulov, E.I., Vannikov, A.V., Chernov, G.M. et al. Photochrome conversions of a copolymer of styrene with indolinospiropyran. Russ Chem Bull 24, 2374–2377 (1975). https://doi.org/10.1007/BF00921650
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DOI: https://doi.org/10.1007/BF00921650