Abstract (2-Pyridylmethoxy)calix[n]arenes (n=6,8) were newly synthesized. It was shown in two-phase solvent extraction that they can extract not only alkali metal cations but Cu2+, Ag+, and UO22+ and are stable even at high pH. The results indicate that disadvantages of calixarene esters, which were previously developed as calixarene-based ionophores, can be improved by using the pyridyl group.
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Shinkai et al. (1989) studied this question.
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