Copolymerization of ethylene with norbornene catalyzed by cationic rare earth metal fluorenyl functionalized N-heterocyclic carbene complexes

doi:10.1039/b910306f

CORC > 化学研究所 > 中国科学院化学研究所

	Copolymerization of ethylene with norbornene catalyzed by cationic rare earth metal fluorenyl functionalized N-heterocyclic carbene complexes
	Wang, Baoli 1,2; Tang, Tao 1; Li, Yuesheng 1; Cui, Dongmei 1
刊名	DALTON TRANSACTIONS
	2009
期号	41 页码:8963-8969
ISSN号	1477-9226
DOI	10.1039/b910306f
英文摘要	Rare earth metal bis(alkyl) complexes attached by fluorenyl modified N-heterocyclic carbene (NHC) (Flu-NHC)Ln(CH(2)SiMe(3))(2) (Flu-NHC = (C(13)H(8)CH(2)CH(2)(NCHCCHN)C(6)H(2)Me(3)-2,4,6); Ln = Sc (2a); Y (2b); Ho (2c); Lu (2d)), ((tBu)Flu-NHC)Ln(CH(2)SiMe(3))(2) ((tBu)Flu-NHC = 2,7-(t)Bu(2)C(13)H(6)CH(2)CH(2)(NCHCCHN)C(6)H(2)Me(3)-2,4,6; Ln = Sc (1a); Lu (1d)) and attached by indenyl modified N-heterocyclic carbene (Ind-NHC)Ln(CH(2)SiMe(3))(2) (Ind-NHC = C(9)H(6)CH(2)CH(2)(NCHCCHN)C(6)H(2)Me(3)-2,4,6; Ln = Sc (3a); Lu (3d)), under the activation of Al(i)Bu(3) and [Ph(3)C][B(C(6)F(5))(4)], showed varied catalytic activities toward homo- and copolymerization of ethylene and norbornene. Among which the scandium complexes, in spite of ligand type, exhibited medium to high catalytic activity for ethylene polymerization (10(5) g mol(Sc)(-1) h(-1) atm(-1)), but all were almost inert to norbornene polymerization. Remarkably, higher activity was found for the copolymerization of ethylene and norbornene when using Sc based catalytic systems, which reached up to 5 x 10(6) g mol(Sc)(-1) h(-1) atm(-1) with 2a. The composition of the isolated copolymer was varying from random to alternating according to the feed ratio of the two monomers (r(E) = 4.1, r(NB) = 0.013). The molecular structure of complex 1d was characterized by X-ray analysis. The influences of structural factors of complexes and polymerization conditions on both the catalytic activity and the norbornene content in the copolymer were discussed.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000270761900023
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/68339]
专题	中国科学院化学研究所
通讯作者	Cui, Dongmei
作者单位	1.Acad Sinica, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Wang, Baoli,Tang, Tao,Li, Yuesheng,et al. Copolymerization of ethylene with norbornene catalyzed by cationic rare earth metal fluorenyl functionalized N-heterocyclic carbene complexes[J]. DALTON TRANSACTIONS,2009(41):8963-8969.
APA	Wang, Baoli,Tang, Tao,Li, Yuesheng,&Cui, Dongmei.(2009).Copolymerization of ethylene with norbornene catalyzed by cationic rare earth metal fluorenyl functionalized N-heterocyclic carbene complexes.DALTON TRANSACTIONS(41),8963-8969.
MLA	Wang, Baoli,et al."Copolymerization of ethylene with norbornene catalyzed by cationic rare earth metal fluorenyl functionalized N-heterocyclic carbene complexes".DALTON TRANSACTIONS .41(2009):8963-8969.