SYNERGIC EXTRACTION OF COBALT(II) WITH THENOYLTRIFLUOROACETONE AND TETRAPHENYLARSONIUM CHLORIDE FROM ACETATE MEDIUM

Cobalt has been synergically extracted into benzene with thenoyltrifluoroacetone (TTA) in combination with tetraphenylarsonium chloride [(C6Hs)4,AsCl] from acetate medium. The composition of the synergic product at pH 3-8 has been determined. The plot of log d against log hydrogen ion concentration shows an inverse second power dependence on hydrogen ion concentration. The plot of log D vs. log TTA concentration gives a slope of 2. A similar plot of log D vs. log (OAc) gives a slope of 1 and the plot of log D against log t(C6H5)4AsCl] shows a first power dependence of distribution ratio on [(C6H5)4AsCl]. The synergic complex has been isolated from the organic phase and the absorption spectra of the dark brown compound has been compared with the yellow complex of cobalt formed with TTA only, similarly isolated from organic phase. The synergic complex is not polymeric whereas the complex formed with TTA only is polymeric. The ratio of cobalt, TTA, acetate and tetraphenylarsonium chloride is 1:2:1:1; thus it is proposed that cobalt forms a five coordinated anion complex with TTA and acetate. This anion forms an ion association complex with tetraphenylarsonium cation. © 1969, American Chemical Society. All rights reserved.