Crystal structure of bis(3-bromopyridine-κN)bis(O-ethyl dithiocarbonato-κ2S,S′)nickel(II)

Abstract

In the title molecular complex, [Ni(C3H5OS2)2(C5H4BrN)2], the Ni2+cation is located on a centre of inversion and has a distorted octahedral N2S4environment defined by two chelating xanthate ligands and two monodentate pyridine ligands. The C—S bond lengths of the thiocarboxylate group are indicative of a delocalized bond and the O—Csp2bond is considerably shorter than the O—Csp3bond, consistent with a significant contribution of one resonance form of the xanthate anion that features a formal C=O+unit and a negative charge on each of the S atoms. The packing of the molecules is stabilized by C—H...S and C—H...π interactions. In addition, π–π interactions between the pyridine rings [centroid-to-centroid distance = 3.797 (3) Å] are also present. In the crystal structure, molecules are arranged in rows along [100], forming layers parallel to (010) and (001).