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学科主题: 金属有机化学
题名: Halogen-substituted 2,6-bis(imino)pyridyl iron and cobalt complexes: Highly active catalysts for polymerization and oligomerization of ethylene
其他题名: 卤素取代吡唑二亚胺铁和钴配合物: 乙烯聚合和齐聚高活性催化剂
作者: Chen YF(陈耀峰) ; Chen RF(陈瑞芳) ; Qian ZT(钱长涛) ; Dong XC(董喜成) ; Sun J(孙杰)
通讯作者: 钱长涛
刊名: Organometallics
发表日期: 2003
卷: 22, 期:21, 页:4312-4321
收录类别: SCI
部门归属: 中国科学院上海有机化学研究所金属有机化学开放实验室; 中国科学院上海有机化学研究所计算机化学与化学信息研究室
英文摘要: A series of halogen-substituted 2,6-bis(imino)pyridyl ligands and their iron and cobalt complexes [{2,6-(2,6-X1X2C6H3NdCCH3)2C5H3N=MCl2] (X1 = X2 ) Br, M = Fe (1), Co (2); X1= X2 = Cl, M = Fe (3), Co (4); X1 = Cl, X2 = H, M = Fe (5), Co (6); X1 = Br, X2 = H, M = Fe(7), Co (8); X1= I, X2 = H, M ) Fe (9), Co (10)) and [M{2,6-(2,6-X1X2C6H3NdCCH3)2C5H3N?2}]2+- [MCl4]2- (X1 ) F, X2 ) H, M ) Fe (11)) have been synthesized. The molecular structures of complexes 1, 8, 9, 10, and 11 were determined by X-ray diffraction. Crystallographic analyses indicate that 1, 8, 9, and 10 are five-coordinate complexes, while 11 is an ion-pair complex with one six-coordinate iron center and one four-coordinate iron center. These metal coordinative complexes, activated by modified methylaluminoxane (MMAO), lead to highly active ethylene polymerization and/or oligomerization catalysts. The catalyst productivity and product properties crucially depended on the metal center and the halogen substituents on the aryl rings. The catalyst productivities are in the range of (0-73.0) _ 106 g/mol of catah. The species 11, having ion-pair structure, is inactive. In particular, the product molar masses were changed from high molar mass (Mw of 377 000) to low molar mass oligomers by varying the halogen substituents. NMR and thermal analyses reveal the polymer is highly linear. The oligomer products follow a Schulz-Flory distribution with high selectivity for linear R-olefins. The effects of reaction condition on the polymerization and oligomerization have also been studied.
语种: 英语
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WOS记录号: WOS:000185841200025
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内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/15267
Appears in Collections:金属有机化学国家重点实验室_期刊论文

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Recommended Citation:
Chen YF,Chen RF,Qian ZT,et al. Halogen-substituted 2,6-bis(imino)pyridyl iron and cobalt complexes: Highly active catalysts for polymerization and oligomerization of ethylene[J]. Organometallics,2003,22(21):4312-4321.
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