Crown-containing styryl dyes .19. Complexation and cation-induced aggregation of chromogenic aza-15-crown-5-ethersстатья
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Аннотация:Complexation of styryl dyes containing the N-phenylaza-15-crown-5 fragment (trans-2a,b) with Ca2+ ions in MeCN was studied. Unlike cationic dye trans-2a, betaine trans-2b forms both complexes of 1:1 stoichiometry and aggregates consisting of four dye molecules and one Ca2+ ion. Cation-induced aggregation was observed also for the analog of dye trans-2b, which contains a dimethylamino group instead of an azacrown ether fragment (trans-3). Apparently, the interaction between a metal cation and sulfo groups of molecules trans-2b or trans-3 makes the main contribution to the stability of aggregates. The dependence of the stability of aggregates on the nature of the metal cation was studied.