Solvent Extraction of Copper(II) with 2-(o-Hydroxyphenyl)benzothiazole

Equilibrium and kinetic aspects of the solvent extraction of Cu(II) with 2-(o-hydroxyphenyl)benzothiazole have been carried out using a water–chloroform system. The complex extracted into chloroform was greenish-brown in color and the absorbance at 490.0 nm obeyed Beer’s law up to 2×10−4 mol/dm3. The complex was 1 : 2 (Cu2+ : ligand) type and the over-all stability constant, β2, was 1.3×1017 at an ionic strength of 0.3. The extraction constant, Kex, was 2.5×10−8. The extraction kinetics were first order with Cu(II) ions and the reagent anions. The rate constant for the reaction was found to be 5.0×109 mol−1 min−1.