Abstract
The mononuclear (telluroether)platinum and βpalladium complexes cisβ[PtCl~2~{Te(CH~2~SiMe~3~)~2~}~2~] (2c), transβ[PtCl~2~{Te(CH~2~SiMe~3~)~2~}~2~] (2t), and transβ[PdCl~2~{Te(CH~2~SiMe~3~)~2~}~2~] (3t) have been prepared from bis(trimethylsilylmethyl)tellane and bis(benzonitrile)dichloridoplatinum and βpalladium and structurally characterized by singleβcrystal Xβray diffraction and NMR spectroscopy. The isomer distribution of the platinum complex depends on the initial molar ratio of the reactants. When [PtCl~2~(NCPh)~2~] was used in excess, 2c was the main product. Upon increasing the initial ligand/metal molar ratio, the relative amount of 2t increased. The stoichiometric reaction afforded approximately equal amounts of the cis and trans isomers. Further increase of the initial amount of the ligand yielded 2t. The mononuclear palladium complex was the trans isomer 3t, regardless of the initial molar ratio of the reactants. Small amounts of the dinuclear complex [Pt~2~Cl~4~{ΞΌβTe(CH~2~SiMe~3~)~2~}{Te(CH~2~SiMe~3~)~2~}~2~] (4) were also formed, when the initial ligand/metal molar ratio was low. Compound 4 shows a rare bridging telluroether ligand and two different platinum coordination environments, one exhibiting a cisβCl/cisβTeR~2~ arrangement and the other a transβCl/transβTeR~2~ arrangement. In case of palladium, the equimolar reaction afforded [Pd~2~(ΞΌβCl)~2~Cl~2~{Te(CH~2~SiMe~3~)~2~}~2~] (5) in good yields. As the relative amount of the ligand was increased, also 3t was formed. When the ligand/metal ratio was >2:1, 3t was the only product. (Β© WileyβVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)