TLC Resolution Studies of Two-Phase Separation of Metal-2-Mercapto-4-Methyl-5-PhenyIazopyrimidine Complexes on Various Surfactant-Impregnated Silica Gel-G Plates

摘要

Mercapto-4-methyl-5-phenylazopyrimidine (MMPAP) complexes of cobalt(ll), nickel(ll), lead(ll), cadmium(ll), and copper(ll) are resolved using various pure and binary solvent mixtures on silica gel-C plates and on different surfactant-impregnated silica gel-G plates. Thin-layer chromatography of complex mixtures with the binary solvent, acetonitrile-xylene (70:30), provides an effective separation of the complexes, especially when tetrabutyl ammonium hydroxide is used as the surfactant. Slope analysisapplied to metal ion distribution experiments from 3M HNO_3 shows a predominant formation of the solvated organic phase complex M(NO_3)_2 centre dot 2MMPAP. The developed method is tested for the determination of cobalt(ll), nickel(ll), lead(ll), cadmium(II), and copper(ll) in standard alloys.