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New crown‐containing and crownless chromenes were synthesized. Their physical properties and photochemistry were characterized. Crown‐containing chromenes form inclusion complexes with Mg2+ cation. Two types of photochemical reactions were observed for all the studied chromenes. The photoreaction of the first type is cis–trans isomerization of styryl fragment in closed form. Second type of photoreaction is the reversible formation of open form responsible for the photochromism of chromenes. Arrhenius parameters of back reactions are determined. Both crownless and crown‐containing chromenes do not demonstrate cation‐dependent photochromism, which is explained by the peculiarities of the structure of open form.
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Glebov et al. (2009) studied this question.
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