Abstract
A series of 2-(chloro-substituted-1 H-benzoimidazol-2-yl)-6-(1-aryliminoethyl)pyridines ( L1– L6) was synthesized and fully characterized. They reacted with NiCl 2 or (DME)NiBr 2 to form the corresponding N^N^N tridentate nickel dichlorides ( C1– C6) or dibromides ( C7– C12). All nickel complexes were characterized by elemental analysis and infrared spectroscopy, while the X-ray diffraction study reveals the distorted octahedral geometry of representative nickel dichloride complex C3 and nickel dibromide complex C7. All nickel complexes, activated with either Et 3Al 2Cl 3 or Et 2AlCl, showed good activities in ethylene oligomerization, and notably remarkably high selectivity of α-olefins was achieved in the presence of Et 3Al 2Cl 3. The chloro-substituted ligands enhanced the activities of complexes in ethylene polymerization.
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