LIQUID-CHROMATOGRAPHY OF METAL-COMPLEXES OF N-DISUBSTITUTED DITHIOCARBAMIC ACIDS .1. HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY OF NICKEL(II) BIS-DIALKYLDITHIOCARBAMATES

The possibility of the separating and identification of nickel(II) bisdialkyl- dithiocarbamate (DTC) complexes by high-performance liquid-solid chromatography has been studied. Silica gel was used as the stationary phase and chloroform- cyclohexane mixtures as the mobile phase. The capacity factors (k′) of dimethyl- up to dioctyl-DTC were measured as a function of the mobile phase composition. The influence of the branching of some N-dialkyl substituents was studied. The relationship between log K′ and the number of carbon atoms in the alkyl substituents was investigated. The separation of DTC complex mixtures is very complicated because exchange reactions have been observed to take place between every pair of complexes and, as a result of these reactions, new compounds are formed. © 1979.