化学学报 ›› 2012, Vol. 70 ›› Issue (18): 1909-1916.DOI: 10.6023/A12060342 上一篇    下一篇

研究论文

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

王新科a,b, Sit Met-Metc, 孙杰a, 唐勇a, 谢作伟b,c   

  1. a 金属有机化学国家重点实验室 中国科学院上海有机化学研究所 上海 200032;
    b 沪港化学合成联合实验室 中国科学院上海有机化学研究所 上海 200032;
    c 香港中文大学化学系 香港新界沙田
  • 投稿日期:2012-06-25 发布日期:2012-08-14
  • 通讯作者: 唐勇,谢作伟
  • 基金资助:

    项目受国家自然科学基金(No. 20932008)、国家自然科学基金/香港资助局(No. N_CUHK470/10 to ZX and No. 21061160493 to TY)和中国科学院-求槎基金(No. GJHZ200816)资助.

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

Wang Xinkea,b, Sit Met-Metc, Sun Jieaa, Tang Yonga, Xie Zuoweib,c   

  1. a State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;
    b Shanghai-Hong Kong Joint Lab in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;
    c Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
  • Received:2012-06-25 Published:2012-08-14
  • Supported by:

    Supporting information for this article is available free of charge via the Internet at http://sioc-journal.cn Project supported by the National Natural Science Foundation of China (No. 20932008), NSFC/RGC Joint Research Scheme (No. N_CUHK470/10 to ZX and No. 21061160493 to TY) and the CAS-Croucher Funding Scheme (No. GJHZ200816).

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.

关键词: 乙烯聚合, 乙烯/己烯共聚合, 第四族金属配合物, 水杨醛亚胺, 分子内迁移

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.

Key words: ethylene polymerization, ethylene/1-hexene copolymerization, group 4 metal complex, salicylaldaminato, intramolecular migration