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New neutral nickel(II) complexes bearing pyrrole-imine chelate ligands: synthesis, structure and norbornene polymerization behavior
Li, YS; Li, YR; Li, XF
2003-02-03
Source PublicationJOURNAL OF ORGANOMETALLIC CHEMISTRY
ISSN0022-328X
Volume667Issue:1-2Pages:185-191
AbstractNew neutral nickel(II) complexes bearing nonsymmetric bidentate pyrrole-imine chelate ligands (4a-d), [2-(ArNCH)C4H3N]Ni(PPh3)Ph [Ar=2,6-diisopropylphenyl (a), 2-methyl-6-isopropylphenyl (b), 2,6-diethylphenyl (c), 2-tert-butylphenyl (d)], have been prepared in good yields from the sodium salts of the corresponding ligands and trans-Ni(PPh3)(2)(Ph)Cl, and the structure of complex 4a has been confirmed by X-ray crystallographic analysis. These neutral Ni(II) complexes were investigated as catalysts for the vinylic polymerization of norbornene. Using modified methylaluminoxane (MMAO) as a cocatalyst, these complexes display very high activities and produce great mass polymers. Catalyst activity of up to 4.2 x 10(7) g (mol Ni h)(-1) and the viscosity-average molecular weight of polymer of up to 9.2 x 10(5) g mol(-1) were observed. Catalyst activity, polymer yield, and polymer molecular weight can be controlled over a wide range by the variation of reaction parameters such as Al-Ni ratio, norbornene-catalyst ratio, monomer concentration, polymerization reaction temperature and time. (C) 2003 Elsevier Science B.V. All rights reserved.
KeywordNeutral Ni(Ii) Complexes Catalysts Norbornene Vinylic Polymerization
DOI10.1016/S0022-328X(02)02181-2
Indexed BySCI ; IC ; CCR
Language英语
WOS IDWOS:000181147000025
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:62[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81488
Collection中国科学院化学研究所
Corresponding AuthorLi, YS
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Li, YS,Li, YR,Li, XF. New neutral nickel(II) complexes bearing pyrrole-imine chelate ligands: synthesis, structure and norbornene polymerization behavior[J]. JOURNAL OF ORGANOMETALLIC CHEMISTRY,2003,667(1-2):185-191.
APA Li, YS,Li, YR,&Li, XF.(2003).New neutral nickel(II) complexes bearing pyrrole-imine chelate ligands: synthesis, structure and norbornene polymerization behavior.JOURNAL OF ORGANOMETALLIC CHEMISTRY,667(1-2),185-191.
MLA Li, YS,et al."New neutral nickel(II) complexes bearing pyrrole-imine chelate ligands: synthesis, structure and norbornene polymerization behavior".JOURNAL OF ORGANOMETALLIC CHEMISTRY 667.1-2(2003):185-191.
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