Ethylene polymerization by iron complexes with symmetrical and unsymmetrical ligands

被引：58

作者：

Ma, Z ^{[1
]}

Sun, WH ^{[1
]}

Li, ZL ^{[1
]}

Shao, CX ^{[1
]}

Hu, YL ^{[1
]}

Li, XH ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, State Key Lab Engn Plast, Beijing 100080, Peoples R China

来源：

POLYMER INTERNATIONAL | 2002年 / 51卷 / 10期

关键词：

ethylene polymerization; ethylene oligomerization; late transition metal complex;

D O I：

10.1002/pi.913

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of penta-coordinated iron complexes with 2,6-bis(imino)pyridine ligands were prepared and used in ethylene polymerization or oligomerization with methylaluminoxane as (MAO) co-catalyst. The activity of the complexes depends strongly on the steric and electronic effects of the ligands, in which the electronic conjugated system plays an important role. NN'-Bis(alpha,alpha-diphenyl) methyl 2,6-bis(imino)pyridine iron complex (1) could not activate ethylene, N,N'-difluorenyl-2,6-bis(imino)pyridine iron complex (2) exhibited high activity for ethylene oligomerization, whilst N,N'-diaryl 2,6-bis(imino)pyridine iron complexes (3-6) performed ethylene polymerization. The results are collected and briefly discussed. (C) 2002 Society of Chemical Industry.

引用

页码：994 / 997

页数：4

共 16 条

[11]

NIEUWENHUIS RA, 1980, PET TECH, V268, P46

[12] Polymerization of propylene by a new generation of iron catalysts: Mechanisms of chain initiation, propagation, and termination [J].

Small, BL ;

Brookhart, M .

MACROMOLECULES, 1999, 32 (07) :2120-2130

[13] Highly active iron and cobalt catalysts for the polymerization of ethylene [J].

Small, BL ;

Brookhart, M ;

Bennett, AMA .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (16) :4049-4050

[14]

Spitzer E. L. T. M., 1981, SEIFEN OELE FETTE WA, V107, P141

[15] alpha-Olefin polymerization with ether-coordinated chromium(III) alkyls [J].

White, PA ;

Calabrese, J ;

Theopold, KH .

ORGANOMETALLICS, 1996, 15 (26) :5473-5475

[16] THE MULHEIM NORMAL PRESSURE POLYETHYLENE PROCESS [J].

ZIEGLER, K ;

HOLZKAMP, E ;

BREIL, H ;

MARTIN, H .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 1955, 67 (19-2) :541-547

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