Oxygen effect in heterobimetallic catalysis: The Zr-O-Ti system as an excellent example for olefin polymerization

被引：44
|
作者：
Gurubasavaraj, Prabhuodeyara M.
Roesky, Herbert W.
Sharma, Prabhuodeyara M. Veeresha
Oswald, Rainer B.
Dolle, Volker
Herbst-Irmer, Regine
Pal, Aritra
机构：
[1] Univ Gottingen, Inst Inorgan Chem, D-37077 Gottingen, Germany
[2] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany
[3] Basell R&D Polymer Phys & Characterizat, Frankfurt, Germany
[4] Gulbarga Univ, Dept Chem, Gulbarga, India
来源：
ORGANOMETALLICS | 2007年 / 26卷 / 14期
关键词：
D O I：
10.1021/om070235k
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
This paper describes the synthesis of a covalently linked oxygen-bridged heterobimetallic complex of zirconium and titanium (2) by using the precursors Cp*2ZrMe(OH) (1) and Cp*TiMe3. The crystal structural data show that complexes 1 and 2 crystallize in the orthorhombic and monoclinic system, respectively. Compound 2, when activated with methylaluminoxane (MAO), shows high activity in ethylene homopolymerization and produces LLDPE. A theoretical study on complex 2 reveals that the bridging oxygen enhances the Lewis acidity at the metal centers. Preliminary investigation of the catalytically active species shows that the initial attack of MAO occurs at the titanium center. Complex 2 exhibits good thermal stability in high-temperature polymerization reactions. The polymer products were characterized by C-13 NMR, DSC measurement, and GPC analysis.
引用
收藏
页码：3346 / 3351
页数：6
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