Inorganic Chemistry, Vol.49, No.9, 4179-4185, 2010
Tellurium(0) as a Ligand: Synthesis and Characterization of 2-Pyridyltellurolates of Platinum(II) and Structures of [Pt{2-Te-3-(R)C5H3N}(2)Te(PR'(3))] (R = H or Me)
Treatment of toluene solutions of the ditellurides [Te-2{C5H3N(R)-3}(2)] (R = H or Me) with [Pt(PPh3)(4)] yielded two types of complexes, [Pt{2-Te-3-(R)C5H3N}(2)(PPh3)(2)] (1a-d) as the major products and [Pt{2-Te-3-(R)C5H3N}(2)Te(PPh3)] (2a-d) as minor products. The above complexes can also be obtained by the reaction of [PtCl2(PR'(3))(2)] (PR'(3) = PPh3 or PPh2(2-C5H4N)) with 2 equiv of Na(2-Te-C5H3R) The complexes were characterized by elemental analyses and UV-vis, NMR (H-1 and P-31), and (in part) XPS spectroscopy The molecular structures of [Pt(2-Te-C5H4N)(2)Te(PPh3)] (2a) and [Pt{2-Te-C5H3(Me)N}(2)Te(PPh3)] (2b) were established by single crystal X-ray diffraction. Both complexes exhibit a distorted square-planar configuration at the platinum(II) centers The two mutually trans positioned 2-pyridinetellurolate ligands [2-Te-C5H3(R)N] coordinate to the central platinum atom in a monodentate fashion through the tellunum atoms. The tellurium(0) atom adopts a "bent T" configuration as it is bridging the 2-Te-C5H3(R)N molecules via N-Te-N bonds (166 degrees angle) and coordinates to Pt-II in the trans position to PPh3. The novel bis(pyridine)tellunum(0) arrangement resembles the bis(pyridine)iodonium structure The calculated NICS indices and ELF functions clearly show that the compounds 2a and 2b are aromatic in the region defined by the Te-C-N-Te-Pt five-membered rings.