Abstract
Spiropyrans of the 2-oxaindan series with 2H-chromene fragments benzo- and 2,3-naphthoannelated at the 7–8 bond were synthesized. The molecular structures of four of the spiropyrans obtained were determined by x-ray diffraction studies, and their photo- and thermochromic properties were studied. Annelation of arene rings significantly increases the relative stabilities fo the photocolored forms of the spiropyrans. A correlation between the length of the Cspiro-O bond and the capacity of spiropyrans for photocoloration was discovered. In addition, the free energies of activation of the thermochromic transformations of spiropyrans determined by dynamic NMR spectroscopy are insensitive to variations in the length of the indicated bond.
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Communication XIX from the series “Photo- and thermochromic spirans.” See [1] for Communication XVIII.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 744–755, June, 1987.
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Aldoshin, S.M., Lokshin, V.A., Rezonov, A.N. et al. Structures and photo- and thermochromic properties of spiropyrans of the 2-oxaindan series with polycondensed chromene fragments. Chem Heterocycl Compd 23, 614–624 (1987). https://doi.org/10.1007/BF00486903
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DOI: https://doi.org/10.1007/BF00486903