Conclusions
An x-ray diffraction structural analysis of photochromic 1'-3',3'-trimethyl-6-nitro-8-bromospiro (4-azaindoline-2,2'-t2H-l]benzopyran) showed that azaindoline and indoline spiropryans have similar structures, in which the Cspiro-O bond cleaved upon photoexcitation is elongated and weakened.
Literature cited
D. P. Maisuradze, Sh. A. Akhobadze, N. I. Malashvili, L. V. Devidze, and K. G. Dzhaparidze, in: Abstracts of the Fourth All-Union Conference on Silverless and Unusual Photographic Processes [in Russian], Vol. 2, Suzdal, Chernogolovka (1984).
S. M. Aldoshin and L. O. Atovmyan, Izv. Akad. Nauk SSSR, Ser. Khim., 2009 (1985).
S. M. Aldoshin, L. O. Atovmyan, O. A. D'yachenko, and M. A. Gal'bershtat, Izv. Akad. Nauk SSSR, Ser. Khim., 2720 (1981).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2593–2595, November, 1986.
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Aldoshin, S.M., Atovmyan, L.O. & Kozina, O.A. Structure of photochromic l',3', 3'-trimethyl-6-nitro-8-bromospiro (4-azaindoline-2,2'-[2h-1]benzopyran). Russ Chem Bull 35, 2379–2381 (1986). https://doi.org/10.1007/BF00953362
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DOI: https://doi.org/10.1007/BF00953362