The Separation of Cobalt(II), Copper(II), Zinc(II), Lead(II), and Cadmium(II) as Their 3-Methyl-1-phenyl-4-thiobenzoyl-5-pyrazolone (SBMPP) Chelates by Thin-layer Chromatography on Silica Gel

Abstract

Abstract Thin-layer chromatographic separation technique has been employed for the separation of Co(II), Ni(II), Cu(II), Zn(II), Pb(II), and Cd(II) as their 3-methyl-1-phenyl-4-thiobenzoyl-5-pyrazolone (SBMPP) chelates. Metal chelates are intensely coloured and so no additional reagent was needed for the development of spots. Silica gel G was used as an adsorbent in the form of thin layer coating (0.25 mm) on glass plates (5 cm × 20 cm). The Rf values of SBMPP and metal–SBMPP chelates have been determined by the ascending method with pure solvents and various binary solvent mixtures on thin layer of silica gel. In benzene the order of Rf values is Cd(II)<Pb(II)<Zn(II)<Co(II)<SBMPP<Ni(II)=Cu(II). By employing solvents like dichloromethane, benzene, and toluene, mutual separation of metal complexes was achieved successfully. The mixed solvents are more useful for the mutual separation of chelates than the pure solvents.