A biphenylene-bridged dinuclear constrained geometry titanium complex for ethylene and ethylene/1-octene polymerizations

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Permethylated cyclopentadienyl dinuclear constrained geometry titanium catalyst, [mu-(C6H4)(2)-2,2']{(eta(5)-C5Me3)[1-Me2Si(eta(1)-N-Bu-t)](TiCl2)}(2) (BPTi2) linked by a biphenylene bridge was synthesized and tested in ethylene and ethylene/1-octene polymerizations upon activation by TIBA (triisobutylaluminum)/[Ph3C][B(C6F5)(4)]. When compared with the corresponding highly active, mononuclear analogs, Me2Si(eta(5)-2-PhC5Me3)(eta(1)-N-Bu-t)TiCl2 (PhTi1) and Me2Si(eta(5)-C5Me4)(eta(1)-N-Bu-t)TiCl2 (MeTi1), BPTi2 exhibits significantly increased molecular weight of polymer (>two-fold), as well as high level of activity and 1-octene incorporations in ethylene and ethylene/1-octene polymerizations. Although the lower activity was observed at high 1-octene feeds, the combined effects of rigidity and electronic conjugation induced by the biphenylene bridge might be responsible for the observed polymerization properties of BPTi2. (C) 2011 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

OLEFIN POLYMERIZATION; STYRENE COPOLYMERIZATION; COMONOMER ENCHAINMENT; BINUCLEAR CATALYSTS; MOLECULAR-WEIGHT; METALLOCENE; POLYMETHYLENE; COCATALYSTS; PROXIMITY; MECHANISM

Citation

JOURNAL OF ORGANOMETALLIC CHEMISTRY, v.696, no.26, pp.4315 - 4320

ISSN
0022-328X
DOI
10.1016/j.jorganchem.2011.10.010
URI
http://hdl.handle.net/10203/93620
Appears in Collection
CH-Journal Papers(저널논문)
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