边臂修饰的水杨醛亚胺第四族金属配合物的合成、结构及其乙烯聚合行为研究(英文)

Synthesis, Structure and Ethylene Polymerization Behavior of Group 4 Metal Complexes Bearing Salicylaldaminato Ligands with Appended Donor Functionality

通过给电子基团取代的(E)-2,4-二-叔丁基-6-(苯基亚胺基甲基)苯酚与等当量的M(CH2Ph)4反应制备了一系列第四族金属的双苄基配合物.反应经历了甲苯消除及分子内苄基从金属至亚胺碳的迁移反应,中间体的分离和结构鉴定证实了该反应历程.通过核磁、元素分析和X-ray单晶衍射表征了配合物的结构.在甲基铝氧烷(MMAO)的活化下,钛配合物可以高活性地催化乙烯的均聚合和乙烯/1-己烯的共聚合,而相应的锆、铪的配合物在同样的条件下则几乎没有活性.

A series of group 4 metal complexes were synthesized by an equimolar reaction of M（CH2Ph）4 with（E）-2,4-di-tert-butyl-6-[（phenylimino）methyl]phenol bearing donor functionality.This process involved toluene elimination followed by an intramolecular migration reaction of one benzyl group from metal to the imino carbon,which was supported by the isolation and structural characterization of the intermediate.These new complexes were fully characterized by multinuclear NMR spectroscopy,elemental analyses and X-ray analyses.The titanium complexes showed a very high activity in both ethylene polymerization and ethylene/1-hexene copolymerization upon activation with modified methylaluminoxane（MMAO）,whereas the corresponding zirconium and hafnium complexes were almost inactive under the same reaction conditions.