Abstract
Purified sodium salt of Cyanex302, di (2,4,4-trimethylpentyl) monothiophosphinic sodium, NaDTMPTP, and that of Cyanex301, di (2,4,4-trimethylpentyl) dithiophosphinic sodium, NaDTMPDTP, are prepared from the corresponding extractant respectively. The thermodynamic function Δ G o→i 0 (standard Gibbs free energy change of transferring alcohol from oil phase to interface phase) and structural parameters of the sodium salt NaA (0.200 g)–alcohol–diluent–H 2 O microemulsion system are measured. The effects of substitution of oxygen by sulfur in the extractant molecule, the used diluent, alcohol, the temperature and water content V H 2 O on the thermodynamic function and structural parameters are discussed and compared with the corresponding sodium salt of phosphinic acid (purified Cyanex272) system, respectively. The replacement of oxygen atom(s) by sulfur in HA or NaA molecules makes their steric configurations and polarities changed.
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