Abstract
Methods of membrane extraction play an important role in technological processes for selective separation of mineral, organic, and biological substrates [1]. Earlier we studied the membrane transport of alkali and alkaline earth metals with phosphorylated azapodands and established the maximum transport efficiency where the metal ion size and pseudocavity formed by the podand are complementary to each other [2, 3]. In the present work we used S-alkyl diesters of bisaryldithiophosphonic acids I–V in the transport through liquid membrane of copper(II), barium(II), and lead(II) ions differing both in the their atomic radii and ability to form coordination compounds with sulfur-containing ligands. The description of synthesis methods and some properties of podands is given in [3–6]. DOI: 10.1134/S1070363210010251
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