The complexes formed in the divalent transition metal-sulphuric acid-di-(2-ethylhexyl)-phosphoric acid extraction systems-cobalt(II), nickel(II) and copper(II) complexes

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Abstract

The complexes formed in the extraction of divalent cobalt, nickel and copper from sulphuric acid solutions by di-(2-ethylhexyl)-phosphoric acid (DEHPTA; HX) have been examined by measurements of apparent mol. wt and magnetic moments, electronic and i.r. spectrophotometry and thermal analyses. For the copper complex, the electron spin resonance spectrum was investigated. It is concluded that the DEHPA complexes of divalent cobalt, nickel and copper have tetrahedral, octahedral and square-planar structures with compositions CoX2.2H2O, (NiX2.2H2O)3 and (CuX2)3 respectively.

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