Synthesis and Characterization of O,O’-(o-, m-, p-Ditolyl/dibenzyl/diphenyldithiophosphate) Complexes with Cobalt

Abstract

Tris(O,O′-ditolyl/dibenzyl/diphenyldithiophosphato)cobalt(III) complexes (1–5) were synthesized by the reaction of CoCl2·6H2O and NH4S2P(OR)2. Initially, the bis(O,O′-ditolyl/dibenzyl/diphenyldithiophosphato)cobalt(II) complexes were formed, oxidized to their analogous tris complexes. In this study, oxidation rate of individual dithiophosphate ligand were investigated on the basis of physical changes. Cobalt(III) complexes (1–5) were characterized by elemental analyses, conductivity measurement, TGA/DSC, and spectroscopic techniques (infrared [IR], ultraviolet [UV]-visible, 1H-, 13C-, and 31P-NMR, mass). The experimental results suggest that these complexes have distorted octahedral geometry with bidentate chelation dithiophosphate moieties. Molecular weight determinations of these complexes indicate their monomeric nature.