Abstract
The syn-2-hydroxy-5-nonylbenzophenone oxime ( syn-HNBPO) is able to produce a mixed, polynuclear copper(II) complex with anti-HNBPO. This complex has a copper:oxime ratio of approximately 1:1.3. In a Lewis cell syn-HNBPO has a strong retarding effect on the rate of copper extraction with anti-HNBPO from a sulphate solution. However, from a chloride solution, the rate of extraction is only slightly retarded by syn-HNBPO. It is suggested that the retardation in the sulphate medium is mainly due to the formation of a mixed syn-HNBPO- anti-HNBPO copper complex at the interface. At a low pH syn-HNBPO extracts only trace amounts of copper(II) and iron(III). However, the selectivity of anti-HNBPO for copper(II) over iron(III) i is shown to be decreased by the presence of syn-HNBPO.
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