Synthesis, characterization, and structural analysis of bis(diphenylphosphino)ethane nickel(II) diethyldithiocarbamate

Nickel dithiocarbamato complex [Ni(S2CNEt2-κ2S,S’)(PPh2C2H4PPh2-κ2P,P’)]PF6 has been synthesized via a ligand substitution reaction between the precursor complex (Ph2PC2H4PPh2-κ2P,P’)NiCl2 and sodium diethyldithiocarbamate (Et2NCS2Na) in the presence of KPF6. The resulting complex was characterized using infrared (IR) spectroscopy, nuclear magnetic resonance (¹H,31P NMR) spectroscopy, and ultraviolet–visible (UV–Vis) spectroscopy, which confirm the successful coordination of the dithiocarbamato ligands. The molecular structure was determined by single-crystal X-ray diffraction, revealing a square-planar coordination geometry around the nickel(II) center. Intramolecular interactions are observed between the fluorine atoms of the PF6⁻ anion and the protons of the ethyl groups. Additionally, the ethyl protons engage in weak C–H···Cl interactions with the chlorine atom of the coordinated CHCl3 molecule. These results highlight the stability and structural features of the dithiocarbamate complex within a diphosphine-supported nickel framework.