Bis(imino)pyridyl iron and cobalt complexes: the effect of nitrogen substituents on ethylene oligomerisation and polymerisation
作者:George J. P. Britovsek、Vernon C. Gibson、Brian S. Kimberley、Sergio Mastroianni、Carl Redshaw、Gregory A. Solan、Andrew J. P. White、David J. Williams
DOI:10.1039/b101173l
日期:——
The synthesis and characterisation of 2,6-bis(imino)pyridyl iron and cobalt complexes [(2,6-(RNCMe)2C5H3N)MCl2] containing nitrogen substituents of the type R = NPh2, NPhMe, NMe2 or 2,5-dimethylpyrrolyl are described. These complexes, in combination with the co-catalyst MAO, give active catalysts for the oligomerisation or polymerisation of ethylene. The catalytic activity is strongly affected by the substituents R and the polymerisation conditions used. The polymer properties are also a function of the R substituents. With R = NPhMe or NMe2, toluene soluble α-olefins are obtained, whereas the bulkier substituents (R = NPh2 or 2,5-dimethylpyrrolyl) give low molecular weight solid polyethylene.
本文介绍了含有 R = NPh2、NPhMe、NMe2 或 2,5-二甲基吡咯基氮取代基的 2,6-双(亚氨基)吡啶基铁和钴配合物 [(2,6-(RNCMe)2C5H3N)MCl2]的合成和特性。这些配合物与辅助催化剂 MAO 结合使用,为乙烯的低聚或聚合提供了活性催化剂。催化活性深受取代基 R 和聚合条件的影响。聚合物的特性也受 R 取代基的影响。当 R = NPhMe 或 NMe2 时,可得到甲苯可溶的 α-烯烃,而体积较大的取代基(R = NPh2 或 2,5-二甲基吡咯基)则可得到低分子量的固体聚乙烯。