Separation and determination of phenylhydrazine-N-dithiocarbamates of ruthenium(III), rhodium(III) and palladium(II) from other Group VIII metals using thin-layer chromatography and visible spectrophotometry

Abstract

Phenylhydrazine-N-dithiocarbamate forms coloured complexes with Ru(III) Rh(III), Pd(II), Fe(III), Ce(III), Ni(II), Ir(III) and Pt(IV). The dithiocarbamates of Ru, Rh, lr and Pd are soluble in acetone whereas those of Fe, Co, Ni and Pt are insoluble. The separation of the phenylhydrazine-N-dithiocarbamates of Ru(III), Rh(III) and Pd(II) from other Group VIII metals and their determination has been carried out using TLC and visible spectrophotometry. Ru, Rh and Pd dithiocarbamates can be resolved successfully in chloroform, benzene, ethyl acetate-carbon tetrachloride (1 + 4) and acetonitrile-carbon tetrachloride (1 + 4). The coloured spots of the dithiocarbamates are visible in daylight and are the same in the different mobile phases.