Abstract
The absorption spectra in the visible region of the merocyanine forms of 1,3,3-trimethyl-6′nitrospiro [indoline-2,2′-[2H-1]benzopyrans] with different substituents in the 5 and 8′ positions were measured. The results are in agreement with concepts regarding the change in the contribution of the polar and nonpolar forms to the resulting merocyanine structure on introduction of substituents.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 659–662, May, 1973.
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Pantsyrnyi, V.I., Gal'bershtam, M.A. Effect of substituents in the 5 and 8′ positions on the absorption spectra of merocyanine forms of spiropyrans. Chem Heterocycl Compd 9, 608–610 (1973). https://doi.org/10.1007/BF00480574
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DOI: https://doi.org/10.1007/BF00480574