Zirconocene complexes with a biphenyl substituted cyclopentadienyl ligand: synthesis, characterization, and olefin polymerization behavior

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Novel zirconocene complexes (1-Biph-3,4-Me2CP)(2)ZrCl2 (3), (C5Me5)(1-Biph-3,4-Me2Cp)ZrCl2 (4), and (C5H5)(1-Biph-3,4-Me2Cp)ZrCl2 (5) containing a 1-biphenyl-3,4-dimethylcyclopentadienyl ligand (2) have been prepared and their solid state structures were characterized by X-ray diffraction method. The crystal structure of 3 revealed a racemic, C-2-symmetric nature in the solid state. In ethylene polymerization, they all afforded high-density polyethylene with very high activity. Especially, the catalytic properties of 3 were most marked in terms of both polymerization activity and molecular weight of polyethylene among them. They also showed good activity on the polymerization of propylene, but afforded nearly atactic, amorphous polypropylenes with a little higher [mmmm] methyl pentad values by 3 and 4 than that by the most active 5 under the given reaction conditions. (c) 2004 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2005-03
Language
English
Article Type
Article
Keywords

GROUP-IVB CATALYSTS; ELASTOMERIC POLYPROPYLENE; PROPYLENE POLYMERIZATION; STEREOBLOCK HOMOPOLYMERS; STEREOCHEMICAL CONTROL; METALLOCENES; STEREOSPECIFICITY; METHYLALUMOXANE; MICROSTRUCTURE; MECHANISMS

Citation

JOURNAL OF ORGANOMETALLIC CHEMISTRY, v.690, no.5, pp.1240 - 1248

ISSN
0022-328X
DOI
10.1016/j.jorganchem.2004.11.031
URI
http://hdl.handle.net/10203/2100
Appears in Collection
CH-Journal Papers(저널논문)
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