Abstract
A series of acyclic polyethers bearing thioamide end-groups and lipophilic alkyl chains were successfully synthesized with moderate yields. Transport measurements in a bulk liquid membrane (BLM) system indicated a very high selectivity of silver ion over other metal cations. Thermodynamic parameters (ΔH, TΔS, and log K) for ligand-metal ion complexations were determined by solution calorimetric titration in methanol at 25 °C. The complexations were enthalpy driven and silver ion exhibited a high selectivity over other metal ions due to the increase of covalent binding between the soft acid (Ag+) and soft base (sulfur).
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