Ethylene polymerization catalyzed by substituted pyrazole nickel complexes |
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Authors: | Simphiwe M Nelana Ilia A Guzei |
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Affiliation: | a Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa b Department of Chemistry, University of Wisconsin at Madison, Madison, WI 53706 USA |
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Abstract: | (Pyrazole)nickel dibromide complexes, (3,5-Me2pz)2NiBr2 (1), (3-Mepz)4NiBr2 (2), (pz)4NiBr2 (3) and (3,5-tBu2pz)2NiBr2 (4), were prepared by the reaction of the appropriate pyrazole with (DME)NiBr2. Solid-state structures of these complexes show a direct relation between the steric bulk of the pyrazole ligand and structure, with more bulky ligands forming four-coordinate complexes (1 and 4) whereas the less bulky ligands formed six-coordinate complexes (2 and 3). Activation of selected complexes (1 and 3) with methylaluminoxane (MAO) produced species that catalyzed the polymerization of ethylene to form high density polyethylene. |
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Keywords: | Pyrazole Nickel Solid-state structures Ethylene polymerization |
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