Synthesis, characterization and structures of cadmium(II) and mercury(II) complexes with bis(dipiperidinylphosphino)methylamine dichalcogenides

摘要

Two new bidentate phosphine dichalcogenide ligands of the type MeN(PipPE) [(Pip = piperidinyl; E = S () or Se ()] and their cadmium(II) and mercury(II) chloride complexes MCl{MeN(PipPE)} [M = Cd; E = S (); Se () or M = Hg; L = S (); Se ()] were prepared and characterized by elemental analysis, IR, multinuclear (P, Se and Cd) NMR spectroscopy and single crystal X-ray analyses. Ligands and were found to adopt anti conformation structures in the solid state in which both P=E groups are trans to each other. Complexes - are comprised of one ligand coordinated in a bidentate fashion to the metal centre in a distorted tetrahedral arrangement [98.46(3)-121.24(4)°]. The P=S bond lengths of 1.999(15)-2.003(14) Å in the complex () are slightly elongated compared to those in free ligand [1.933(15)-1.950(14) Å]. The results are discussed and compared with closely related analogues.