Synthesis, Structures, and Norbornene Polymerization Behavior of Neutral Nickel(II) and Palladium(II) Complexes Bearing Aryloxide Imidazolidin-2-imine Ligands

被引：35

作者：

Li, Mingyuan ^{[1
]}

Shu, Xin ^{[1
]}

Cai, Zhengguo ^{[1
]}

Eisen, Moris S. ^{[2
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer, Shanghai 201620, Peoples R China

[2] Technion Israel Inst Technol, Schulich Fac Chem, IL-32000 Haifa, Israel

来源：

ORGANOMETALLICS | 2018年 / 37卷 / 07期

基金：

中国国家自然科学基金;

关键词：

HETEROCYCLIC CARBENE LIGANDS; IMIDAZOLIN-2-IMINATO TITANIUM COMPLEXES; BRIDGED BIS(IMIDAZOLIN-2-IMINE) LIGAND; TRANSITION-METAL-COMPLEXES; CYMENE RUTHENIUM COMPLEXES; ETHYLENE POLYMERIZATION; VINYLIC POLYMERIZATION; ALPHA-OLEFINS; COORDINATION CHEMISTRY; TRANSFER HYDROGENATION;

D O I：

10.1021/acs.organomet.8b00059

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A series of novel aryloxide imidazolidin-2-imine bidentate neutral Ni(II) and Pd(II) complexes bearing five and six-membered chelate ring structures were synthesized and characterized. X-ray diffraction analysis results revealed that all of the Ni(II) complexes (Ni1-Ni3) and Pd(II) complexes (Pd1 and Pd3) adopted an almost square-planar geometry. In the presence of various cocatalysts such as MAO, MMAO, Et2AlCl, and EtAlCl2, all of the Ni(II) and Pd(II) complexes exhibited remarkably high activities (up to 2.6 X 10(7) g of PNB (mol of M)(-1) h(-1)) toward the addition polymerization of norbornene. These catalyst systems produced high-molecular weight polynorbornene (PNB) with narrow molecular weight distribution, except for the insoluble PNB obtained with Pd1-Pd3/MAO systems. The Pd(II) complexes showed particularly good thermostability with a high activity of 1.56 X 10(7) g of PNB (mol of Pd)(-1) h(-1) even at 80 degrees C. These complexes are rare examples of neutral Ni(II) and Pd(II) complexes bearing aryloxide-functionalized imidazolidin-2-imine ligands in the field of olefin polymerization.

引用

页码：1172 / 1180

页数：9

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