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To research possible use of sulfonamide-type polyanionic chelators having ethylene bridges as extractants, extraction (cation-exchange) behavior of Cu2+ with several chelators was investigated. Tripod sulfonamide-type chelator, tris [2- (p-toluenesulfonamido) ethyl] amine, showed higher extractability than its monosulfonamide analog, 2- (p-toluenesulfonamido) ethylamine. Although the former can be generally considered as trianionic tetradentate chelator, on extraction of Cu2+, it acted as dianionic tridentate ligand and formed neutral 1: 1 complex having one coordinating H2O. The formed complex seems to be stabilized by chelate effect of the ligand and shielding effect of the coordinating sulfonamido group.

Extraction Behavior of Copper(II) Cation Using Sulfonamide-type Polyanionic Chelators Having Ethylene Bridges