From a set of photochromic spiro[indoline-naphthoxazines] substituted on the oxazine part, a correlation between the electronic charge of the 2′-carbon atom and the absorption wavenumbers of the corresponding coloured forms was found. This relationship is of particular interest to predict the colour developed by this class of photochromic compounds.
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Laréginie et al. (1996) studied this question.
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