Synthesis and X-Ray Crystal Structure of a Mercury(II)-Telluroamine Complex. Monodentate Behaviour by a Potentially Bidentate Hybrid Telluride Ligand, 1-(NMe2)-2-(TeC6H4-4-OEt)-4-MeC6H3.

Abstract The telluroamines 1-(NMe2)-2-(TeAr)-4-MeC6H3 (1) (Ar = 4-MeOC6H4 or 4-EtOC6H4) react with mercury(II) halides forming adducts of composition HgX2 · 1 (X = Cl or Br). The IR, far-IR (up to 50 cm−1), 1H and 13C NMR spectra of the mercury(II) complexes indicate that the ligands (1) behave as monodentate donors, coordinating through tellurium only. The complexes seem to be dimers of the composition [1 · XHg(μ-X)2HgX · 1]. The crystal structure of the adduct obtained from mercury(II) bromide has been determined. It reveals that the NMe2 group does not coordinate with mercury(II) and the complex is a dimer in which two somewhat asymmetrical bromine bridges are present between the mercury atoms. The coordination environment of each mercury is almost tetrahedral [91.25(3)–118.40(4)°]. The HgBr bridging bond lengths are 2.755(1) and 2.710(1) A.