A new vanadium (III) complex of 2,6-Bis(3,5-diphenylpyrazol- 1-ylmethyl)pyridine as a catalyst for ethylene polymerization
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Date
2013
Authors
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Journal ISSN
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Publisher
MDPI
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.
Description
Keywords
Pyrazole, Vanadium complex, Ethylene polymerization, High density polyethylene
Citation
Abbo, H.S. and Titinchi, S.J.J. (2013). A new nanadium (III) complex of 2,6-Bis(3,5-diphenylpyrazol- 1-ylmethyl)pyridine as a catalyst for ethylene polymerization. Molecules. 18: 4728-4738