Synthesis, structure and norbornene polymerization behavior of nickel complexes bearing two beta-ketoiminato chelate ligands
Data(s) |
2004
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Resumo |
A series of nickel(II) complexes bearing two nonsymmetric bidentate beta-ketoiminato chelate ligands have been prepared, and the structures of complexes [(2,6-Me2C6H3)NC(CH3)C(H)C(Ph)O](2)Ni (4a) and [(2,6-Me2C6H3)NC(CH3)C(H)C(CF3)O](2)Ni (4c) have been confirmed by X-ray crystallographic analysis. These nickel(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 high molecular weight polymers. Catalytic activity of up to 1.16 x 10(4) kg/mol(Ni) .h and the viscosity-average molecular 9 weight of polymer of up to 870 kg/mol were observed. Catalyst activity, polymer yield, and polymer molecular weight could be controlled over a wide range by the variation of the reaction parameters such as Al/Ni molar ratio, norbornene/catalyst molar ratio, monomer concentration, polymerization reaction temperature and time. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Zhu YZ;Liu JY;Li YS;Tong YJ.Synthesis, structure and norbornene polymerization behavior of nickel complexes bearing two beta-ketoiminato chelate ligands,JOURNAL OF ORGANOMETALLIC CHEMISTRY,2004,689(7 ):1295-1303 |
Palavras-Chave | #VINYL-TYPE POLYMERIZATION #ADDITION POLYMERIZATION #PALLADIUM(II) COMPLEXES #ALUMINOXANE CATALYSTS #COPOLYMERIZATION #POLYNORBORNENE #HOMOPOLYMERIZATION #ETHYLENE #ETHENE #METHYLALUMINOXANE |
Tipo |
期刊论文 |