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Molecules 2013, 18(4), 4728-4738; doi:10.3390/molecules18044728

A New Vanadium (III) Complex of 2,6-Bis(3,5-diphenylpyrazol-1-ylmethyl)pyridine as a Catalyst for Ethylene Polymerization

Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, Cape Town, South Africa
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Received: 11 March 2013 / Revised: 17 April 2013 / Accepted: 18 April 2013 / Published: 22 April 2013
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Abstract

The tridentate ligand 2,6-bis(3,5-diphenylpyrazol-1-ylmethyl)pyridine, abbreviated as 2,6-[(3,5-ph2pz-CH2)2-py], a new pyridine-pyrazole derivative, was prepared from 2,6-bis(bromomethyl)pyridine and 3,5-diphenylpyrazole. The ligand was characterized by means of elemental analyses, ATR-IR, 1H- and 13C-NMR spectroscopy and single crystal X-ray crystallography. Using this ligand, a new mononuclear vanadium (III) complex, {2,6-[(3,5-ph2pz)CH2]2py}VCl3 was prepared and characterized by elemental analysis, ATR-IR and HR-MS. The complex was investigated as a catalyst for ethylene polymerization and compared with 2,6-[(3,5-Me2pz)CH2]2py}VCl3 to explore the effect of the substituent on the pyrazolyl rings on ethylene polymerization. High catalytic activity was observed at ambient temperature. After treatment with AlEtCl2, these complexes showed high activity for ethylene polymerization converting ethylene to highly linear polyethylene and affording high molecular weight polymers (up to 1.0 × 106 g/mol) with unimodal molecular weight distributions. View Full-Text
Keywords: pyrazole; 2,6-bis(pyrazol-1-ylmethyl)pyridine; vanadium complex; ethylene polymerization; high density polyethylene pyrazole; 2,6-bis(pyrazol-1-ylmethyl)pyridine; vanadium complex; ethylene polymerization; high density polyethylene
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Abbo, H.S.; Titinchi, S.J.J. A New Vanadium (III) Complex of 2,6-Bis(3,5-diphenylpyrazol-1-ylmethyl)pyridine as a Catalyst for Ethylene Polymerization. Molecules 2013, 18, 4728-4738.

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