1214264-75-1Relevant academic research and scientific papers
Ferrous and cobaltous chlorides bearing 2,8-bis(imino)quinolines: Highly active catalysts for ethylene polymerization at high temperature
Zhang, Shu,Sun, Wen-Hua,Xiao, Tianpengfei,Hao, Xiang
, p. 1168 - 1173 (2010)
A series of 2,8-bis(l-aryliminoethyl)quinolines [2,8-(2,6-R 12-4-R2C6H2N=CCH 3)2C9H5N (L), R1 = Me, Et, or i-Pr, R2=H or Me] is synthesized and used in the reaction with ferrous or cobaltous chlorides. The corresponding complexes LMCl2 are limitedly formed with ligands containing ortho-methyl groups of the imino phenyl rings (R=H, M = Fe (Fel), M=Co (Col); R=Me, M = Fe (Fe2), M=Co (Co2). The X-ray diffraction study reveals a distorted pyramidal geometry of Col around the cobalt atom. These complexes, activated with methylaluminoxane (MAO), show unique properties toward ethylene polymerization: no activity observed at low temperature, but high activity achieved at temperatures higher than 80 °C (up to 7.61 x 106 g·mol-1 ·h-1 at 100 °C). Moreover, the polyethylenes obtained are high molecular weight with narrow molecular distribution. This is the first example of iron and cobalt procatalysts with high activity for ethylene polymerization at high temperature.
