Mixed biphosphine complexes of palladium(0); the structure of “bis(diphenylphosphino)ethane”-“bis(dicyclohexylphosphino)ethane” palladium(0)
摘要:
A range of mixed biphosphine complexes of palladium(0) has been prepared and characterized by P-31 NMR spectroscopy. The complexes disproportionate in solution at rates which depend on the nature of the ligands. The structure of [Pd(dcpe)(dppe)] has been established in an X-ray diffraction study.
A complex with a planar hexagonal Pd4Ge3 core, [PdPd(dmpe)}(3)(mu(3)-GePh2)(3)], was synthesized and characterized by X-ray and NMR measurements as well as by DFT calculations. 4-tert-Butylbenzenethiol converted the Pd-4 complex into a hexapalladium complex, [Pd-3(mu-GePh2)(2)-(mu-H)(mu(3)-GePh2((SC6H4Bu)-Bu-t-4))}(2)(mu-dmpe)], composed of two Pd3Ge3 units bridged by a dmpe ligand. The addition of CuI or AgI to the Pd-4 complex yielded [Pd(mu-MI)Pd-(dmpe)}(3)(mu(3)-GePh2)(3)] (M = Cu, Ag), in which Cu or Ag bridges a Pd-Pd bond of the Pd4Ge3 core. The CuI adducts in solution undergo a pivot motion of the CuI on the surface of the Pd4Ge3 plane on the NMR time scale
Mixed biphosphine complexes of palladium(0); the structure of “bis(diphenylphosphino)ethane”-“bis(dicyclohexylphosphino)ethane” palladium(0)
作者:Gillian T.L. Broadwood-Strong、Penny A. Chaloner、Peter B. Hitchcock
DOI:10.1016/s0277-5387(00)81751-9
日期:1993.4
A range of mixed biphosphine complexes of palladium(0) has been prepared and characterized by P-31 NMR spectroscopy. The complexes disproportionate in solution at rates which depend on the nature of the ligands. The structure of [Pd(dcpe)(dppe)] has been established in an X-ray diffraction study.