Selective Liquid Membrane Transport of Lead(II) by an Acyclic Polyether Dicarboxylic Acid Ionophore

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Abstract
The effects of the chain structure and substitutents in six acyclic polyether dicarboxylic acids and one acyclic polyether carboxylic acid upon the efficiency and selectivity of pH-driven Pb2+ transport in a bulk chloroform membrane system have been assessed. Among the carriers, 1,2-bis[2-(o-carboxyphenoxy)ethoxy]-4-tert-butylbenzene (1) is found to exhibit high selectivity for transport of Pb2+ compared with alkali metal cations and a variety of other divalent metal ion species. Ionophore 1 also extracts Pb2+ from aqueous solution into chloroform with the loss of two protons. A 1:1 complex of Pb2+ with di-ionized 1 was isolated.