Calix[4]arenes with hard donor groups as efficient soft cation extractants. Remarkable extraction selectivity of calix[4]arene N-(X)sulfonylcarboxamides for Hg^II

Abstract

Calix[4]arene N-(X)sulfonylcarboxamides efficiently extract Hg^II from acidic aqueous nitrate solutions with excellent selectivity over alkali, alkaline earth and many transition metal ions, including Pb^II, Ag^I and Pd^II.

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