Fe(II) and Co(II) pyridinebisimine complexes bearing different substituents on ortho- and para-position of imines:: synthesis, characterization and behavior of ethylene polymerization

被引：49

作者：

Liu, JY

Zheng, Y

Li, YG

Pan, L

Li, YS

Hu, NH

机构：

[1] State Key Lab. Poly. Phys. and Chem., Changchun Inst. of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2005年 / 690卷 / 05期

基金：

中国国家自然科学基金;

关键词：

iron complex; cobalt complex; catalyst; ethylene polymerization;

D O I：

10.1016/j.jorganchem.2004.11.029

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A series of 2,6-bis(imino)pyridyl iron(II) and cobalt(II) complexes [2,6-(ArN = CMe)(2)C5H3N]MCl2 (Ar = 2,6-i-Pr2C6H3, M = Fe: 3a, M = Cc: 4a; Ar = 2,4,6-i-Pr3C6H2, M = Fe: 3b, M = Co: 4b; Ar = 2,6-i-Pr-2-4-BrC6H2, M = Fe: 3c, M = Cc: 4c; Ar = 2,4-i-Pr-2-6-BrC6H2, M = Fe: 3d, M = Co: 4d) has been synthesized, characterized, and investigated as precatalysts for the polymerization of ethylene in the presence of modified methylaluminoxane (MMAO). The substituents of pyridinebisimine ligands and their positions located significantly influence catalyst activity and polymer property. It is found that the catalytic activities of the iron complexes/ MMAO systems are mainly dominated by electronical effect, while those of the cobalt complexes/MMAO systems are primarily controlled by hindering effect. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：1233 / 1239

页数：7

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