Calix[4]arenes with hard donor groups as efficient soft cation extractants. Remarkable extraction selectivity of calix[4]arene N-(X)sulfonylcarboxamides for HgII
Abstract
Calix[4]arene N-(X)sulfonylcarboxamides efficiently extract HgII from acidic aqueous nitrate solutions with excellent selectivity over alkali, alkaline earth and many transition metal ions, including PbII, AgI and PdII.
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