Syntheses and Characterization of New Mixed-Ligand Mercury(II) Complexes, Hg(bpy)n(SCN)X (X = CH3COO–, NO3– and ClO4–), Crystal Structure of [Hg(bpy)2(SCN)]NO3

Abstract

Abstract The 1:2 and 1:1 mixed-ligand mercury(II) complexes with 2,2’-bipyridine (bpy) containing two different anions, Hg(bpy)n(SCN)X (X= CH3COO−, NO3− and ClO4−), have been synthesized and characterized by elemental analysis, and IR, 1H and 13C NMR spectroscopy. The structure of [Hg(bpy)2(SCN)]NO3 was confirmed by X-ray crystallography. The complex is monomeric and the Hg atom has an unsymmetrical five-coordinate geometry, with four nitrogen atoms of two bpy ligands and one sulfur atom of the thiocyanate ligand as donor atoms. This is in contrast to lead(II) complexes, [Pb(phen)2(NO3)(NCS)], [Pb(phen)(O2CCH3)(NCS)] where the thiocyanate ligands are coordinated to the lead atom via the nitrogen atom. There is a π −π stacking interaction between the parallel aromatic rings.