Novel spirobenzopyran derivatives carrying monoazacrown moieties at the 8-position undergo selective complexation of alkali metal ions and thereby isomerization to their corresponding merocyanine form in the dark; the isomerization is enhanced especially by Li+ that is likely to interact with the phenolate anion intramolecularly when bound to the crown rings.
K. Kimura, T. Yamashita and M. Yokoyama, J. Chem. Soc., Chem. Commun., 1991, 147 DOI: 10.1039/C39910000147
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