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By coupling 5-bromo-(chloro)-7-formyl-8-hydroxyquinoline with 2-methylene-1,3,3-trimethylindoline, the 6'-halogeno-spiro[indoline-2,2'-[3,2-h]-pyrido[2H-1]benzopyrans] 3 have been prepared and their photochromic behaviors studied.The photoinduced merocyanine forms 4 of the spiropyrans form fluorescent complexes with divalent metal ions (Mg 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ ).
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Волошин et al. (2004) studied this question.
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