Abstract
Reactions of N-(1H-benzimidazol-2-ylmethyl)-2-analine (L1), N-(1H-benzimidazol-2-ylmethyl)-2-bromoanaline (L2), N-(1H-benzimidazol-2-ylmethyl)-2-methoxyanaline (L3) and N-(1H-benzimidazol-2-ylmethyl)-2-phenolanaline (L4) with the appropriate nickel(II) salts afforded the respective complexes [Ni(L1)Br2] (1), [Ni(L2)Br2] (2), [Ni(L3)NiBr2] (3), [Ni(L3)Cl2] (4), [Ni(L4)Br] (5) and [Ni(L4)Cl2] (6) in good yields. The structural elucidation of the complexes was achieved using IR spectroscopy, mass spectrometry, magnetic moment measurements and elemental analyses. Upon activation with EtAlCl2 or MAO as co-catalysts, complexes (1–6) formed active catalysts for ethylene oligomerization reactions in addition to Friedel-Crafts alkylation reactions of the preformed oligomers depending on the co-catalyst and solvent system. While activation with EtAlCl2 in toluene produced Friedel-Crafts alkylated products, the use of MAO resulted in the production of mainly C4 and C6 oligomers.
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