Coordination compounds of hydrazine derivatives with transition metals—IV Ni(II)-complexes with hydrazinedithiocarboxylic acid, its methyl ester and their N-isopropylidine derivatives

Abstract

Abstract The reactions of nickel ions with the ammonium salt and the methyl ester of hydrazinedithiocarboxylic acid as well as their N-isopropylidine derivatives were investigated. Magnetic and spectral data were used to determine the structure of the nickel complexes and the mode of chelation of the ligands. The hydrazinedithiocarboxylate ion was shown to act as a monobasic bidentate ligand, forming bis neutral and tris anionic complexes. The corresponding methyl ester functioned as a neutral ligand with the formation of bis and tris cationic complexes. With nickel acetate, the ester acted as a monobasic bidentate molecule through deprotonation of the α-hydrogen of the hydrazine residue, forming bis neutral complexes. The isopropylidine derivatives of both the ammonium salt and the methyl ester of hydrazinedithiocarboxylic acid behaved as monobasic bidentate ligands giving only bis complexes. In all cases, chelation occured through the β-nitrogen and one sulphur atom.