Abstract
Abstract The formation and extraction equilibria of zinc(II) complexes with thiocyanate ions have been determined at 25°C. Zinc(II) ions in 1 m sodium perchlorate constant ionic media containing thiocyanate ions at various concentrations have been extracted into chloroform containing β-isopropyltropolone (IPT), into hexane containing trioctylphosphine oxide (TOPO), or into methyl isobutyl ketone (MIBK). The stability constants of the zinc(II) thiocyanate complexes in the aqueous phase were first determined from the decrease in the IPT chelate extraction, and then the distribution constants for the zinc(II) thiocyanate complexes into the latter two solvents were determined. The results were explained by saying that (i) zinc(II) forms the first (logβ1=0.56), second (logβ2=1.32), and the third (logβ3=1.18) complexes in the above aqueous phase, (ii) TOPO in hexane extracts the second complex as an adduct in the Zn(SCN)2(TOPO)2 form, (iii) MIBK extracts both the second and the third complexes, and (iv) the addition of sodium perchlorate causes a salting-in effect in the lower-ligand-concentration region. Some discussion was made of the dissociation of ion-pairs in the organic phase.
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