Liquid-liquid distribution of ion associates of hexachloroplatinate(IV) with quaternary ammonium counter ions.
The distribution behavior of ion associates of PtCl(6)(2-) with quaternary ammonium cations (Q(+)) between aqueous phase and two organic phases (chloroform and carbon tetrachloride) was examined, and the extraction constants (log K(ex)) were determined. A linear relationship was found between log K(ex) and the total number of carbon atoms in Q(+); from the slope of the line, the contribution of a methylene group to log K(ex) was calculated to be 0.6. The extractability with alkyltrimethylammonium cations was larger than that with symmetrical tetraalkylammonium cations. From the extraction constants obtained, an extraction method based on the ion association of PtCl(6)(2-) with Q(+) can be used for the separation and determination of platinum at the 10(-6) M level.
Yamamoto
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Katoh
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