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+)

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 pi-pi stacking interactions between the parallel aromatic rings in the mercury(II) complex.