Conclusions
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1.
Although each of the bisspiropyrans studied undergoes single-ring opening under the action of light, sequential two-quantum absorption does not occur here.
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2.
The formation of relatively long-lived colored forms of these bisspiropyrans in toluene solution proceeds through short-lived isomers.
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3.
The chromophore interaction is much stronger in the photoinduced B-B form of compound (VIII) (6′-nitrobisspiropyran) than in the other bisspyrans.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 83–88, January, 1977.
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Malkin, Y.N., Kuz'min, V.A. & Mikhailenko, F.A. Photochromic properties of bisspiropyrans. Russ Chem Bull 26, 70–74 (1977). https://doi.org/10.1007/BF00921495
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DOI: https://doi.org/10.1007/BF00921495