Bis(3-methyl-2-pyridyl)ditelluride and pyridyl tellurolate complexes of zinc,cadmium, mercury: Synthesis, characterization and their conversion to metaltelluride nanoparticles
Treatment of an acetonitrile solution of metal chloride with bis(3-methyl-2-pyridyl)ditelluride,Te_2(pyMe)_2, in the same solvent yielded complexes of composition MCl_2{Te_2(pyMe)_2} (M = Zn orCd) whereas reactions of MCl_2(tmeda) with NaTepyR (R = H or Me) gave tellurolate complexes ofthe general formula M(TepyR)_2 (M = Cd or Hg). When the cadmium complex Cd(Tepy)_2 wascrystallized in the presence of excess tmeda, Cd(Tepy)_2(tmeda) was formed exclusively. Thesecomplexes were characterized by elemental analyses, uv-vis, ~1H NMRdata. The crystal structures ofZnCl_2{Te_2(pyMe)_2} and Cd(Tepy)_2(tmeda) were established by single crystal X-ray diffraction. In theformer zinc is coordinated to nitrogen atoms of the pyridyl group, while in the latter the coordinationenvironment around tetrahedral cadmium is defined by the two neutral nitrogen atoms of tmeda, andtwo pyridyl tellurolate ligands. Thermal behavior of some of these complexes was studied bythermogravimetric analysis. Pyrolysis of M(Tepy)_2 in a furnace or in coordinating solvents such ashexadecylamine/tri-n-octylphosphine oxide (HDA/TOPO) at 350 and 160 °C, respectively gave MTenanoparticles, which were characterized by uv-vis, photoluminiscence, XRD, EDAX and TEM.
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