Add time:09/28/2019         Source:sciencedirect.com

The thiocarbonyl donor 2,6-dimethyl-4H-pyran-4-thione (DMTP) forms with zinc(II) and cadmium(II) halides complexes of general formulae [M(DMTP)2X2] and [M(DMTP)X2]n (MCd or Zn; Xhalide). The compounds have been characterized by IR and proton NMR spectroscopy. The crystal structure of [Zn(DMTP)2Cl2] was determined by X-ray crystallography and refined to the final R of 0.060, based on 2073 observed reflections. The crystal is triclinic, P1, with a=7.955(6), b=8.599(6), c=14.098(5) Å, α=92.12(3), β=110.96(3) and γ=108.60(3)°. Zn is tetrahedrally coordinated by two Cl and two S(ligand) atoms. Bond distances (mean values) are ZnCl 2.25, ZnS 2.37, SC 1.69 Å. The IR absorptions due to metal-halide bond vibrations support a distorted tetrahedral structure for all 1:2 complexes. The [Cd(DMTP)Cl2]n adduct has probably a polymeric structure by bridging halides, with the cadmium atom in an octahedral environment, whereas the [M(DMTP)X2]n (MZn, XBr or I; MCd, XI) complexes are dimers by halide bridges. Proton NMR spectra in various deuterated solvents are discussed.

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