Co-catalyst effects on the thermal stability/activity of N,N,N-Co ethylene polymerization Catalysts Bearing Fluoro-Substituted N-2,6-dibenzhydrylphenyl groups
文献类型：期刊论文
| 作者 | Zhang, Qiuyue; Ma, Yanping; Suo, Hongyi; Solan, Gregory A.; Liang, Tongling; Sun, Wen-Hua |
| 刊名 | APPLIED ORGANOMETALLIC CHEMISTRY
 |
| 出版日期 | 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 |
| 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). |
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来源：化学研究所
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