一系列新颖的双(亚氨基)吡啶钴(II)氯化物LCoCl 2具有在苯胺部分带有一个或多个吸电子取代基(F,Cl,Br,CF 3)的双(亚氨基)吡啶配体准备和表征。在甲基铝氧烷(MAO)的存在下,这些配合物表现出高的乙烯低聚和聚合活性(高达1.8·10 7 g产品∙(mol Co)-1 h -1 bar -1),提供的产品范围为1-丁烯和Z,E -2-丁烯至严格线性低分子量(M n 〜300…700)聚乙烯。讨论了反应结果对配体结构的依赖性。
Iron(III) complexes with meta-substituted bis(arylimino)pyridine ligands: Catalyst precursors for the selective oligomerization of ethylene
作者:Christian Görl、Nadine Beck、Katharina Kleiber、Helmut G. Alt
DOI:10.1016/j.molcata.2011.10.011
日期:2012.1
Bis(arylimino)pyridine iron(III) complexes containing meta-halogen substituents at the iminophenyl rings were synthesized and characterized. In contrast to iron(II) complexes, the presence of at least one ortho-substituent at the iminophenyl rings is not obligative for catalytic activities of these iron(III) complexes. After activation with methylaluminoxane (MAO), these catalysts oligomerize ethylene to give also internal and branched olefins besides the expected linear alpha-olefins. The widths of the resulting molecular weight distributions and the degrees of isomerization of the resulting oligomers strongly depend on the substitution pattern at the ligand frameworks. (C) 2011 Elsevier B.V. All rights reserved.