Ethylene Polymerization by Xanthene-Bridged Dinuclear α-Diimine NiII Complexes

被引：89

作者：

Wang, Ruikun ^{[1
]}

Sui, Xuelin ^{[1
]}

Pang, Wenmin ^{[2
]}

Chen, Changle ^{[1
]}

机构：

[1] Chinese Acad Sci, Univ Sci & Technol China, Dept Polymer Sci & Engn, Key Lab Soft Matter Chem, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

来源：

CHEMCATCHEM | 2016年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

binuclear catalysts; chain-walking polymerization; cooperativity effects; Ni catalysts; polymerization; OLEFIN POLYMERIZATION; BRANCHED POLYETHYLENE; LIVING POLYMERIZATION; NICKEL-CATALYST; VINYL ETHERS; C-13; NMR; NORBORNENE COPOLYMERIZATIONS; METAL CATALYSTS; CHAIN-WALKING; INSERTION;

D O I：

10.1002/cctc.201501041

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis, characterization, and ethylene polymerization properties of a series of xanthene-bridged dinuclear alpha-diimine Ni-II complexes are described. The dinucleating alpha-diimine ligands were prepared from the xanthene-bridged di-anilines, which were synthesized and isolated on the multigram scale without using column chromatography. The di-anilines could potentially be used to prepare various dinucleating imine-containing olefin polymerization ligands. In ethylene polymerization, the dinuclear a-diimine Ni-II complexes showed good thermal stability and high catalytic activity. In addition, the polyethylene generated by these dinuclear alpha-diimine Ni-II complexes showed high molecular weight, narrow polydispersity, and very low branching density. Metal-metal cooperativity effects was invoked to explain the slow beta-hydride elimination process and the correspondingly slow chain-walking process.

引用

页码：434 / 440

页数：7

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