| Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties | |
| Department | 羰基合成与选择氧化国家重点实验室 ; 精细石油化工中间体国家工程研究中心 |
Long ZR(龙泽荣); Wu B(吴彪); Yang PJ(杨培菊) ; Li G(李刚); Liu YY(刘艳艳); Yang XJ(杨晓娟)
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| 2009 | |
| Source Publication | Journal of Organometallic Chemistry
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| ISSN | 0022-328X |
| Volume | 694Pages:3793-3799 |
| Abstract | Four iron(II) and cobalt(II) complexes ligated by 2,6-bis(4-nitro-2,6-R2-phenylimino)pyridines, LMCl2 (1: R = Me, M = Fe; 2: R = iPr,M = Fe; 3: R = Me, M = Co; 4: R = iPr, M = Co) have been synthesized and fully characterized, and their catalytic ethylene polymerization properties have been investigated. Among these complexes, the iron(II) pre-catalyst bearing the ortho-isopropyl groups (complex 2) exhibited higher activities and produced higher molecular weight polymers than the other complexes in the presence of methylaluminoxane (MAO). A comparison of 2 with the reference non-nitro-substituted catalyst (2,6-bis(2,6-diisopropylphenylimino)pyridyl)FeCl2 (FeCat 5) revealed a modest increase of the catalytic activity and longer lifetime upon substitution of the para-positions with nitro groups (activity up to 6.0 103 kg mol 1 h 1 bar 1 for 2 and 4.8 103 kg mol 1 h 1 bar 1 for 5), converting ethylene to highly linear polyethylenes with a unimodal molecular weight distribution around 456.4 kg mol 1. However, the iron(II) pre-catalyst 1 on changing from ortho-isopropyl to methyl groups displayed much lower activities (over an order of magnitude) than 2 under mild conditions. As expected, the cobalt analogues showed relatively low polymerization activities. |
| Keyword | Iron(Ii) Cobalt(Ii) Ethylene Polymerization 2 Electronic Effect 6-bis(4-nitro-2 6-r2- phenylimino)Pyridines |
| Subject Area | 金属有机与超分子催化 |
| Funding Organization | the ‘‘Bairen Jihua” project of the Chinese Academy of Sciences |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 金属有机与超分子催化研究组 ; 金属有机功能材料研究组 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/586 |
| Collection | 羰基合成与选择氧化国家重点实验室（OSSO） 精细石油化工中间体国家工程研究中心（ERC） |
| Corresponding Author | Wu B(吴彪) |
| Recommended Citation GB/T 7714 | Long ZR,Wu B,Yang PJ,et al. Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties[J]. Journal of Organometallic Chemistry,2009,694:3793-3799. |
| APA | 龙泽荣,吴彪,杨培菊,李刚,刘艳艳,&杨晓娟.(2009).Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties.Journal of Organometallic Chemistry,694,3793-3799. |
| MLA | 龙泽荣,et al."Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties".Journal of Organometallic Chemistry 694(2009):3793-3799. |
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