A spirobenzothiapyran derivative bearing a monoaza-12-crown-4 moiety affords significant thermal stability enhancement in the UV light induced colored merocyanine form of its photochromic moiety by metal-ion complexation of its crown ether moiety, although the complexation hardly induces the isomerization without photoirradiation.
M. Tanaka, K. Kamada, H. Ando, T. Kitagaki, Y. Shibutani, S. Yajima, H. Sakamoto and K. Kimura, Chem. Commun., 1999, 1453 DOI: 10.1039/A903877I
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