New octahedral bis-α-diimine nickel(II) complexes containing chloro-substituted aryl groups: Synthesis, characterization and testing as ethylene polymerisation catalysts
作者:Jianchao Yuan、Tongjian Mei、Pedro T. Gomes、Maria M. Marques、Xuehu Wang、Yufeng Liu、Chengping Miao、Xiaoli Xie
DOI:10.1016/j.jorganchem.2011.07.009
日期:2011.10
bis-α-diimine nickel (II) complexes containing chloro-substituted ligands, bisbis[N,N′-(3-chloro-2-methylphenyl)imino]-1,2-dimethylethane}dibromonickel 2a, bisbis[N,N′-(3-chloro-2,6-dimethylphenyl)imino]-1,2-dimethylethane}dibromonickel 2b and bisbis[N,N′-(4-chloro-2,6-dimethyl-phenyl)imino]-1,2-dimethylethane}dibromonickel 2c, were synthesized and characterized. The molecular structure of complex 2a was determined
三种新型的20电子双电子α-二亚胺镍(II)配合物,含氯取代的配体,双双[双[ N,N' -(3-氯-2-甲基苯基)亚氨基] -1,2-二甲基乙烷}二溴镍2a,双双[双[ N,N' -(3-氯-2,6-二甲基苯基)亚氨基] -1,2-二甲基乙烷}双溴镍2b和双双[双[ N,N' -(4-氯-2,6合成并表征了-(二甲基-苯基)亚氨基] -1,2-二甲基乙烷}二溴镍2c。配合物2a的分子结构通过X射线晶体学测定。在固态下,配合物2a在镍中心周围具有拟八面体的几何形状,在拟赤道平面中包含两个α-二亚胺配体,另外两个反式溴化物配体占据轴向位置。这些被二乙基氯化铝(DEAC)活化的络合物在温和条件下在乙烯聚合中进行了测试。NMR分析表明,使用这些在芳基中含有吸电子Cl基团的双-α-二亚胺镍(II)配合物(例如在20℃下有84个支链/ 1000℃ )可得到高度支化的聚乙烯。催化活性,聚合物分子