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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
2019-08-08
Source PublicationAPPLIED ORGANOMETALLIC CHEMISTRY
ISSN0268-2605
AbstractThe 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)].
DOI10.1002/aoc.5134
Indexed BySCI
Language英语
WOS IDWOS:000481319000001
EI Accession Number1099-0739
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82669
Collection中国科学院化学研究所
AffiliationChinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
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).
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