Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes

doi:10.1039/c8dt00907d

	Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes
	Chen, Q ; Zhang, WJ ; Solan, GA ; Liang, TL ; Sun, WH
刊名	DALTON TRANSACTIONS
	2018-05-07
卷号	47 期号:17 页码:6124-6133
ISSN号	1477-9226
DOI	10.1039/c8dt00907d
英文摘要	Four examples of phenol- substituted methylene- bridged bis(imino) pyridines, CH(C6H4-4-OH){2'-(4-C6H2-2,6-(R2N)-N-2=CMe)-6'-(2 '',6 ''-(R2C6H3N)-C-1=CMe)C5H3N}(2) [R-1 = R-2 = Me L1, R-1 = R-2 = Et L2, R-1 = Et, R-2 = Me L3, R-1 = iPr, R-2 = Me L4], have been synthesized and fully characterized. Treatment of L1-L4 with two equivalents of cobaltous chloride affords the bimetallic complexes, [(L)Co2Cl4] (L = L1 Co1, L2 Co2, L3 Co3, L4 Co4), in good yield. The molecular structure of Co1 shows the two metal centers to be separated by a distance of 13.339 A with each cobalt displaying a distorted trigonal bipyramidal geometry. On activation with either MAO or MMAO, Co1-Co4 exhibited high activities for ethylene polymerization (up to 1.46 x 10(7) g(PE) mol(-1)(Co) h(-1) at 50 degrees C) with their relative values influenced by the steric properties of the N- aryl groups: Co1 > Co3 > Co4 > Co2. Highly linear polyethylenes incorporating high degrees of vinyl end- groups are a feature of all the materials produced with the molecular weights of the MAO- promoted systems (M-w range = 2-8 kg mol(-1)) generally higher than seen with MMAO (M-w range = 1-3 kg mol(-1)), while the distributions using MMAO are narrower (PDI < 2.0).
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000431816000030
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41973]
专题	化学研究所_工程塑料实验室
作者单位	1.Zhang, WJ 2.Solan, GA 3.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China. 4.Zhang, WJ 5.Solan, GA 6.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China. 7.Sun, WH (reprint author), Univ Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Beijing 100019, Peoples R China. 8.Zhang, WJ (reprint author), Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing 100029, Peoples R China. 9.Solan, GA (reprint author), Univ Leicester, Dept Chem, Univ Rd, Leicester LE1 7RH, Leics, England.
推荐引用方式 GB/T 7714	Chen, Q,Zhang, WJ,Solan, GA,et al. Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes[J]. DALTON TRANSACTIONS,2018,47(17):6124-6133.
APA	Chen, Q,Zhang, WJ,Solan, GA,Liang, TL,&Sun, WH.(2018).Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes.DALTON TRANSACTIONS,47(17),6124-6133.
MLA	Chen, Q,et al."Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes".DALTON TRANSACTIONS 47.17(2018):6124-6133.