Chromium(III) complexes ligated by 2-(1-isopropyl-2-benzimidazolyl)-6-(1-(arylimino)ethyl) pyridines: Synthesis, characterization and their ethylene oligomerization and polymerization

被引：54
作者：
Chen, Yanjun [1 ,2 ,3 ]
Zuo, Weiwei [1 ,2 ]
Hao, Peng [1 ,2 ]
Zhang, Shu [1 ,2 ]
Gao, Kun [3 ]
Sun, Wen-Hua [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
[3] Lanzhou Univ, State Key Lab Appl Organ Chem, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China
来源：
JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2008年 / 693卷 / 04期
基金：
中国国家自然科学基金;
关键词：
chromium complexes; 2-(benzimidazolyl)-6-iminopyridine; ethylene oligomerization; polymerization;
D O I：
10.1016/j.jorganchem.2007.11.049
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A series of chromium(III) complexes bearing 2-(1-isopropyl-2-benzimidazolyl)-6-(1-(arylimino)ethyl) pyridines were synthesized and characterized by IR spectroscopic and elemental analysis. The X-ray crystallographic analysis revealed a distorted octahedral geometry of the chromium complexes. When activated by Et(2)AlCl, MAO or MMAO, these chromium complexes exhibited catalytic activities for ethylene oligomerization and polymerization; while the good to high activities ( up to 3.95 x 10(6) g mol(-1) (Cr) h(-1)) were observed in the catalytic systems with MMAO. Therefore, various reaction parameters of the catalytic system with MMAO were investigated in detail. The steric and electronic effects of ligands affected the catalytic activities and the distribution of the products predominantly. Interestingly, sometimes their distributions of oligomers did not resemble the rules of Schulz-Flory or Poisson due to the hexenes produced in low yield. (c) 2007 Elsevier B. V. All rights reserved.
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收藏
页码：750 / 762
页数：13
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