Pyridine- and 3-/6-methylpyridine-2-tellurolate complexes of palladium(II) and platinum(II)

The reaction of py(2)Te(2) or (3-MeC5H3N)(2)Te-2 with Na2PdCl4 in methanol yields an insoluble brown complex, [PdCl(TeNC5H3R)](n) (R = H or Me). Several reactions of pyTe(-), (3-MeC5H3N)Te-, or (6-MeC5H3N)Te- with various palladium(ii) and platinum(n) complexes have been carried out. Complexes of the types [MCl(Te-N)(PR3)], [Pt(Te-N)(2)(dppe)], [Pt(Te-N)(2)(PPh3)(2)], and [Pt-2(p-Te-N)(2)(dppe)(2)][BPh4](2) [M = Pd or Pt; Te-N = pyTe, (3- or 6-MeC5H3N)Te] have been prepared and characterized by elemental analyses, UV/Vis, IR, and NMR (H-1, P-31, Pt-195) spectroscopy. The complexes [MCl(Te-N)(PR3)] show irreversible oxidation and reduction by CV in DMF. The molecular structure of [PdCl{Te(3-MeC5H3N)}(PPh3)] (2c) has been established by single-crystal X-ray diffraction analysis. The palladium atom is bound to the chelating 3-methylpyridinetellurolate ligand, a chlorine atom and a PPh3 ligand. The pyrolysis of [PdCl{Te(3-MeC5H3N))(PR3)] (PR3 = PEt3 or PPh3) at 340 degreesC yields PdTe. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.