Abstract
The syntheses of pyridyl containing calix[4]arene receptors ( 4, 5, and 11) that adopt the cone conformation are reported. The complexation properties of these host molecules were estimated via the results of alkali metal picrate extraction experiments. A singly-bridged bis-calix[4]arene, i.e. 4 does not appear to be an efficient alkali metal picrate extractant. A doubly-bridged bis-calix[4]arene, i.e. 5, displays elevated extraction avidity toward Rb + and Cs + picrates when compared with that of 4. A pyridyl containing calix[4]arene-crown-5, i.e. 11, shows improved avidity and selectivity toward extraction of K + and Rb + picrates vis-a-vis the corresponding behavior of 4 and 5.
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