Photo- and Thermochromic Spirans. 39. Study of the Complexation of a New Crown-containing Benzoxazine Spiropyran with Metal Cations

A new benzoxazinone spiropyran containing a crown ether fragment have been synthesized. This compound was studied by both experimental and theoretical methods. In contrast to previously studied analogs, photoinduced coloration is not observed. By irradiating this crown-containing spiropyran, only an E-Z isomerization reaction proceeds. Complexation of the closed spiropyran form runs in a solution containing a calcium salt. A hypsochromic shift of the long-wavelength maximum in the absorption spectrum is observed.