Mercury(II) and Lead(II) complexes with 2,2′-Bis (4,5-dimethylimidazole) – syntheses, characterization and crystal structures of [M(DmImH)(SCN)2], (M = Hg2+ and Pb2+ )

Abstract

Mercury(II) and lead(II) complexes with 2,2′-bis(4,5-dimethylimidazole) (DmImH), [Hg(DmImH)(SCN)2] and [Pb(DmImH)(NCS)2], have been synthesized and characterized by IR specta and elemental analyses. The molecular structure of [Pb(DmImH)(NCS)2] n is polymeric with four-coordinate lead atoms. The [Hg(DmImH)(SCN)2] complex is built up of monomeric Hg(SCN)2 units with one “DmImH” ligand coordinated to the Hg atom via the two N atoms in a distorted tetrahedral environment. The thiocyanate ligands are coordinated to lead via nitrogen, but to mercury via the sulfur. There are π–π stacking interactions between the parallel aromatic rings in the mercury(II) complex.