Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups

doi:10.1002/aoc.5134

CORC > 化学研究所 > 中国科学院化学研究所

	Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups
	Zhang, Qiuyue; Ma, Yanping; Suo, Hongyi; Solan, Gregory A.; Liang, Tongling; Sun, Wen-Hua
刊名	APPLIED ORGANOMETALLIC CHEMISTRY
	2019-08-08
ISSN号	0268-2605
DOI	10.1002/aoc.5134
英文摘要	The unsymmetrical bis (arylimino)pyridines, 2-[CMeN{2,6-{(4-FC6H4)(2)CH}(2)-4-t-BuC6H2}]-6-(CMeNAr)C5H3N (Ar = 2,6-Me2C6H3 L1, 2,6-Et2C6H3 L2, 2,6-i-Pr2C6H3 L3, 2,4,6-Me3C6H2 L4, 2,6-Et-2-4-MeC6H2 L5), each containing one N-aryl group bedecked with ortho-substituted fluorobenzhydryl groups, have been employed in the preparation of the corresponding five-coordinate cobalt (II) chelates, LCoCl2 (Co1 - Co5); the symmetrical comparator [2,6-{CMeN(2,6-(4-FC6H4)(2)CH)(2)-4-t-BuC6H2}(2)C5H3N]CoCl2 (Co6) is also reported. All cobaltous complexes are paramagnetic and have been characterized by H-1/F-19 NMR spectroscopy, FT-IR spectroscopy and elemental analysis. The molecular structures of Co3 and Co6 highlight the different degrees of steric protection given to the metal center by the particular N-aryl group combination. Depending on the aluminoxane co-catalyst employed to activate the cobalt precatalyst, distinct variations in thermal stability and activity of the catalyst towards ethylene polymerization were exhibited. In particular with MAO, the resultant catalysts reached their optimal performance at 70 degrees C delivering high activities of up to 10.1 x 10(6) g PE (mol of Co)(-1) h(-1) with Co1 > Co4 > Co2 > Co5 > Co3 >> Co6. On the other hand, using MMAO, the catalysts operate most effectively at 30 degrees C but are by comparison less productive. In general, the polyethylenes were highly linear, narrowly disperse and displayed a wide range of molecular weights [M-w range: 18.5-58.7 kg mol(-1) (MAO); 206.1-352.5 kg mol(-1) (MMAO)].
语种	英语
WOS记录号	WOS:000481319000001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/82669]
专题	中国科学院化学研究所
作者单位	Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qiuyue,Ma, Yanping,Suo, Hongyi,et al. Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups[J]. APPLIED ORGANOMETALLIC CHEMISTRY,2019.
APA	Zhang, Qiuyue,Ma, Yanping,Suo, Hongyi,Solan, Gregory A.,Liang, Tongling,&Sun, Wen-Hua.(2019).Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups.APPLIED ORGANOMETALLIC CHEMISTRY.
MLA	Zhang, Qiuyue,et al."Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups".APPLIED ORGANOMETALLIC CHEMISTRY (2019).