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On Photocolored Product Structure of Photochromic Azomethines in Solutions and Crystals

Abstract Comparative data of the experimental and quantum-chemical investigations of the photochromic anils and model compounds lead to the conclusion about unusual “twisted” cis (with regard to C—N—bond) zwitterion N H-structure of photocolored form with nearly orthogonal Ar-C-and CH—NH+-groups. This form is stabilized kinetically by the intermolecular interactions in the rigid media and crystals.