Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts

doi:10.1021/acs.organomet.7b00809

	Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts
	Wang, Z ; Solan, GA ; Mahmood, Q ; Liu, QB ; Ma, YP ; Hao, X ; Sun, WH
刊名	ORGANOMETALLICS
	2018-02-12
卷号	37 期号:3 页码:380-389
ISSN号	0276-7333
DOI	10.1021/acs.organomet.7b00809
英文摘要	Five distinct alpha,alpha'-bis (arylimino)-2,3:5,6-bis-(hexamethylene) pyridine-cobalt (II) chloride complexes, [2,3:5,6-{C5H10C(NAr)}(2)C5HN]CoCl2 (Ar = 2,6-Me2C6H3, Co1; 2,6-Et2C6H3, Co2; 2,6-i-Pr2C6H3, Co3; 2,4,6-Me3C6H2, Co4; 2,6-Et-2-4-MeC6H2, Co5), have been synthesized by one pot template reaction of alpha,alpha'-dioxo-2,3:5,6-bis(hexamethylene)-pyridine with the corresponding aniline and cobalt(II) chloride in acetic acid. The molecular structures of Co2 and Co3 reveal distorted square pyramidal geometries with two conformation ally flexible eight-membered rings, a feature of the ligand manifold. On activation with either methylaluminoxane (MAO) or modified MAO (MMAO), all five complexes displayed high catalytic activities for ethylene polymerization (up to 3.62 X 10(6) g PE mol(-1) (Co) h(-1)) generating strictly linear polyethylenes with the activity decreasing in the orders: Co4 > Co5 > Co1 > Co2 > Co3 (MAO) and Co1 > Co4 > Co2 > Co5 > Co3 (MMAO). Moreover, the nature of the aluminoxane cocatalyst employed had a marked effect on the molecular weight and distribution (M-w/M-n) of the polymeric material obtained. For example using MAO, high molecular weight polyethylene (M-w approximate to 10(5) g mol(-1)) with a narrow monomodal molecular weight distribution (2.1-3.6) was a characteristic, while using MMAO, the polyethylene was of lower molecular weight (M-w approximate to 10(4) g mol(-1)) and exhibited a mono- to bimodal distribution (10.1-23.8) depending on the ratio of MMAO employed, temperature, and run time.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000425193000015
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41975]
专题	化学研究所_工程塑料实验室
作者单位	1.Solan, GA 2.Sun, WH (reprint author), Chinese Acad Sci, Key Lab Engn Plast, Inst Chem, Beijing 100190, Peoples R China. 3.Solan, GA 4.Sun, WH (reprint author), Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China. 5.Sun, WH (reprint author), Univ Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Beijing 100049, Peoples R China. 6.Solan, GA (reprint author), Univ Leicester, Dept Chem, Univ Rd, Leicester LE1 7RH, Leics, England. 7.Liu, QB (reprint author), Hebei Normal Univ, Coll Chem & Mat Sci, Shijiazhuang 050024, Hebei, Peoples R China.
推荐引用方式 GB/T 7714	Wang, Z,Solan, GA,Mahmood, Q,et al. Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts[J]. ORGANOMETALLICS,2018,37(3):380-389.
APA	Wang, Z.,Solan, GA.,Mahmood, Q.,Liu, QB.,Ma, YP.,...&Sun, WH.(2018).Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts.ORGANOMETALLICS,37(3),380-389.
MLA	Wang, Z,et al."Bis(imino)pyridines Incorporating Doubly Fused Eight-Membered Rings as Conformationally Flexible Supports for Cobalt Ethylene Polymerization Catalysts".ORGANOMETALLICS 37.3(2018):380-389.