Bridged bis-pyridinylimino dinickel(II) complexes: Syntheses, characterization, ethylene oligomerization and polymerization
                                
                                    
                                        作者:Suyun Jie、Dongheng Zhang、Tianzhu Zhang、Wen-Hua Sun、Jiutong Chen、Qing Ren、Dongbing Liu、Gang Zheng、Wei Chen                                    
                                    
                                        DOI:10.1016/j.jorganchem.2005.01.029
                                    
                                    
                                        日期:2005.3
                                    
                                    A series of bridged bis(pyridinylimino) ligands were efficiently synthesized through the condensation reaction of 4,4'-methylenebis(2,6-disubstituted aniline) with 2-pyridinecarboxaldehyde or 2-benzoylpyridine. They reacted with (DME)NiBr(2) to form dinuclear Ni(II) complexes. All resultant compounds were characterized by elemental analysis, IR spectra as well as the single-crystal X-ray diffraction to confirm the structures of ligands and complexes. Activated with methylaluminoxane (MAO), these nickel complexes showed considerably good activities for ethylene oligomerization and polymerization. Their catalytic activities and the properties of PEs obtained were depended on the arched environment of ligand and reaction conditions. (c) 2005 Elsevier B.V. All rights reserved.