Abstract
A series of new p- tert-butyl thiacalix[4]arenes with o-, m-, p-amido and o-, m-, p-(amidomethyl)pyridine substituents at the lower rim in cone, partial cone, and 1,3- alternate conformations were synthesized. The ability of the obtained compounds to recognize the α-hydroxy (glycolic, tartaric) and dicarboxylic (oxalic, malonic, succinic, fumaric, and maleic) acids was investigated by UV–vis spectroscopy. Also, the efficiency and selectivity of binding, the association constants log K a (10 2 to 10 7 M −1) and the stoichiometry were determined for the complexes of p- tert-butyl thiacalix[4]arenes with the acids. The receptors based on p- tert-butyl thiacalix[4]arenes with (amidomethyl)pyridine substitutes are most efficient in complexation in many cases.
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