Titanium complexes with novel triaryl-substituted phosphinimide ligands: Synthesis, structure and ethylene polymerization behavior
作者:Changhe Qi、Suobo Zhang
DOI:10.1016/j.jorganchem.2005.11.048
日期:2006.3
Ti–O bond was consistent with the normal Ti–O (donor) bond length. The complexes 7 and 8 displayed inactive to ethylenepolymerization, and the complex 9 displayed moderate activity in the presence of modified methylaluminoxane (MMAO) or i-Bu3Al/Ph3CB(C6F5)4, and this should be partly attributed to coordination of THF with titanium and the steric effect of two iso-propoxyl. And catalytic activity up to
一系列磷化亚膦酰亚胺钛配合物[Ph 2 P(2-RO-C 6 H 4)] 2 TiCl 2(7,R = CH 3 ; 8,R = CHMe 2)和[PhP(2-Me 2 CHO–C通过使TiCl 4与相应的膦亚胺在脱卤代甲硅烷基化下反应制备了6 H 4 ]] [THF] TiCl 3(9)。配合物9的结构通过X射线晶体学测定,发现溶剂分子THF与中心金属配位,并且Ti-O键与正常的Ti-O(供体)键长度一致。配合物7和8对乙烯聚合反应无活性,而配合物9在改性甲基铝氧烷(MMAO)或i -Bu 3 Al / Ph 3 CB(C 6 F 5)4存在下显示中等活性,这应该是部分归因于THF与钛的配位以及两个异丙氧基的空间效应。并观察到高达32.2 kg-PE /(mol-Ti h bar)的催化活性。