Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties

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	Synthesis and characterization of para-nitro substituted 2,6-bis(phenylimino)pyridyl Fe(II) and Co(II) complexes and their ethylene polymerization properties
	Yang XJ(杨晓娟); Yang PJ(杨培菊)
刊名	Journal of Organometallic Chemistry
	2009
卷号	694 页码:3793-3799
关键词	Iron(II) Cobalt(II) 2 Ethylene polymerization Electronic effect 6-bis(4-nitro-2 6-R2- phenylimino)pyridines
ISSN号	0022-328X
通讯作者	吴彪
中文摘要	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.
学科主题	金属有机与超分子催化
收录类别	SCI
资助信息	the ‘‘Bairen Jihua” project of the Chinese Academy of Sciences
语种	英语
WOS记录号	WOS:000270369400016
公开日期	2012-09-21
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/586]
专题	兰州化学物理研究所_OSSO国家重点实验室兰州化学物理研究所_ERC国家工程研究中心
推荐引用方式 GB/T 7714	Yang XJ,Yang PJ. 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	杨晓娟,&杨培菊.(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	杨晓娟,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.