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Abstract
Equilibrium distribution coefficients have been determined, for the extraction of cobalt(II) with resacetophenone oxime as a function of pH and reagent concentration at ambient temperature. RAPOX forms simple 1
2 chelate with cobalt(II). Synergistic extraction was observed with pyridine and its methyl derivatives and some organophosphorous compounds. From the extraction equilibrium data, the adduct formation constants of 12 chelate to adducting ligand adducts were evaluated.
Abstract
Equilibrium distribution coefficients have been determined for the extraction of cobalt(II) with 8-mercaptoquinoline as a function of pH and reagent concentraton at ambient temperature. The extractable complex is a diadduct, i. e. two molecules of the reagent are coordinated to the cobalt(II) chelate. The adduct formation constant in chloroform and the overall formation constant in the aqueous phase have been determined. Pyridine and its methyl derivatives were found to enhance the extraction of Co(II) into chloroform in the presence of 8-mercaptoquinoline. From the extraction equilibrium data, the adduct formation constants of 1
2 chelate to nitrogen base adducts were evaluated. The special role of steric factors is discussed.
Abstract
A simple procedure is described for the preparation of carrier-free copper-64,67 nuclides from a zinc target exposed to fast neutrons. The irradiated target is dissolved in water, and thepH of the solution is adjusted to about six. Radioactive copper nuclides are then extracted with a 1% solution of resacetophenone oxime in cyclohexanone. Zinc is not extracted under these conditions. Radiocopper is back-extracted by shaking the organic phase with dilute mineral acid. About 5 mCi of carrier-free64Cu can be obtained from 1 g of zinc.
The solid-state deaquation of thetrans- andcis-oximates of lawsone (I) and phthiocol (II) with cobalt(II) was investigated by means of non-isothermal thermogravimetry. The modes of deaquation during the thermolyses of hydrated oximates of (I) and (II) with compositions CoL2·2H2O were compared. The weight lossvs. temperature data were treated by using the Coats and Redfern relations. The kinetic data support a rearrangement-type mechanism for the deaquation of the oximate of phthiocol. TheE a values for both the ligands and water molecules were found to be ∼23 kJ/mol.
