摘要:
                                Novel square planar Pd(II) alpha-diimines [PdX2{ArN=C(Cl)}(2)], where Ar = C6H5, (2,6-Me2C6H3), (2,6-(Pr2C6H3)-Pr-i) and X = Cl or Br, and the octahedral Ni(II) complex [NiBr2{(C6H5)N=C(Cl)}(2)(THF)(2)] have been prepared and characterised by spectroscopic methods. For two of the Pd(II) complexes and the Ni(II) complex the crystal structures were determined by X-ray crystallography. A further insight into the geometry and electronic structure of [PdBr2{(2,6-Me2C6H3)N=C(Cl)}(2)] was gained using density functional theoretical calculations (DFT). This compound resembles structurally and electronically typical olefin polymerisation pre-catalysts supported by alpha-diimines incorporating methyl-and 1,8-naphtalenyl substituents at the ligand backbone. The chlorine-substituted backbone of the free ligand [2,6-Me2C6H3N=C(Cl)](2) can be employed in further alkylation reactions to generate new multifunctional ligand prototypes with potential uses as ansa-metallocene/diimines building blocks for catalytic applications of heterobimetallic complexes. (C) 2009 Elsevier B.V. All rights reserved.