Crown ether styryl dyes - 23. Synthesis and complexation of cis-isomers of photochromic dithia-15(18)-crown-5(6) ethersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A novel styryl dye containing benzodithia-18-crown-6 and N-(4-sulfobutyl)benzothiazolium fragments was synthesized. The complex formation of the cis-isomers of several photochromic styryl dyes containing dithia-15(18)-crown-5(6) fragments with Hg2+ and Mg2+ ions was studied. The stability constants of the complexes with Mg2+ and the relative stability constants of the complexes with Hg2+ (with respect to benzo-1,10-dithia-18-crown-6 ether) were measured. The fact that the stability constant increases 11-fold on going from the trans- to the corresponding cis-isomer was attributed to the formation of an anion-"capped" complex.