Synthesis and characterization of indenyl-functionalized N-heterocyclic carbene complex of Ni(II)
摘要:
A new type of Ind-NHC ligand precursor (Ind = indenyl), [C9H7-(CH2)(3)-(CH {(NCHCHNPr)-Pr-i})]Br(HL center dot HBr, 1), was designed and prepared. The reaction of in situ generated anionic indenyl-functionalized NHC ligand LLi with (DME)NiCl2 affords a novel mono-ligand Ni(II) bromide, [C9H6-(CH2)(3)-(C{(NCHCHNPr)-Pr-i})]NiBr (2), which was characterized by elemental analysis, NMR and X-ray crystal determination. Complex 2 in combination with NaBPh4 can catalyze the polymerization of styrene at 80 degrees C. (c) 2006 Elsevier B.V. All rights reserved.
Alkylidenverbrückte dissymmetrische zweikernige Metallocenkomplexe als Katalysatoren für die Ethylenpolymerisation
作者:Matthias Deppner、Ralf Burger、Helmut G. Alt
DOI:10.1016/j.jorganchem.2003.11.043
日期:2004.4
dissymmetric alkylidene bridgeddinuclearmetallocene complexes of titanium, zirconium and hafnium and some of the corresponding mononuclear reference complexes. The influence of structural parameters on the polymerization behaviour of the MAO activated complexes is systematically investigated for homogeneous ethylene polymerization. The dinuclear catalysts show higher polymerization activities than a mixture