Pyrrolide-supported lanthanide alkyl complexes. Influence of ligands on molecular structure and catalytic activity toward isoprene polymerization

doi:10.1021/om7003095

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	Pyrrolide-supported lanthanide alkyl complexes. Influence of ligands on molecular structure and catalytic activity toward isoprene polymerization
	Yang, Yi ; Liu, Bo ; Lv, Kui ; Gao, Wei ; Cui, Dongmei ; Chen, Xuesi ; Jing, Xiabin
刊名	ORGANOMETALLICS
	2007-08-27
卷号	26 期号:18 页码:4575-4584
ISSN号	0276-7333
DOI	10.1021/om7003095
英文摘要	The N,N- bidentate ligands 2- {( N- 2,6- R) iminomethyl)} pyrrole ( HL1, R) dimethylphenyl; HL2, R) diisopropylphenyl) have been prepared. HL1 reacted readily with 1 equiv of lanthanide tris( alkyl)s, Ln(CH2SiMe3)(3)(THF)(2), affording lanthanide bis(alkyl) complexes L(1)Ln(CH2SiMe3)(2)(THF)(n) (1a, Ln= Lu, n = 2; 1b, Ln = Sc, n = 1) via alkane elimination. Reaction of the bulky ligand HL2 with 1 equiv of Ln(CH2SiMe3)(3)( THF)(2) gave the bis(pyrrolylaldiminato) lanthanide mono(alkyl) complexes L(2)(2)Ln- (CH2SiMe3)(THF) (2a, Ln) Lu; 2b, Ln = Sc), selectively. The N,N- bidentate ligand HL3, 2- dimethylaminomethylpyrrole, reacted with Ln( CH2SiMe3) 3( THF) 2, generating bimetallic bis( alkyl) complexes of central symmetry ( 3a, Ln = Y; 3b, Ln = Lu; 3c, Ln = Sc). Treatment of the N,N,N,N- tetradentate ligand H2L4, 2,2'-bis(2,2-dimethylpropyldiimino) methylpyrrole, with equimolar Lu(CH2SiMe3)(3)(THF)(2) afforded a C-2- symmetric binuclear complex ( 4). Complexes 3a, 3b, 3c, and 4 represent rare examples of THF- free binuclear lanthanide bis( alkyl) complexes supported by non- cyclopentadienyl ligands. All complexes have been tested as initiators for the polymerization of isoprene in the presence of AlEt3 and [ Ph3C][B(C6F5)(4)]. Complexes 1a, 1b, and 3a show activity, and 1b is the most active initiator, whereas 2a, 2b, 3b, 3c, and 4 are inert. The microstructure of the resultant polyisoprene has a cis- 1,4 or trans- 1,4 configuration depending on the initiator applied.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000248865600031
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/60295]
专题	中国科学院化学研究所
通讯作者	Cui, Dongmei
作者单位	1.Chinese Acad Sci, 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	Yang, Yi,Liu, Bo,Lv, Kui,et al. Pyrrolide-supported lanthanide alkyl complexes. Influence of ligands on molecular structure and catalytic activity toward isoprene polymerization[J]. ORGANOMETALLICS,2007,26(18):4575-4584.
APA	Yang, Yi.,Liu, Bo.,Lv, Kui.,Gao, Wei.,Cui, Dongmei.,...&Jing, Xiabin.(2007).Pyrrolide-supported lanthanide alkyl complexes. Influence of ligands on molecular structure and catalytic activity toward isoprene polymerization.ORGANOMETALLICS,26(18),4575-4584.
MLA	Yang, Yi,et al."Pyrrolide-supported lanthanide alkyl complexes. Influence of ligands on molecular structure and catalytic activity toward isoprene polymerization".ORGANOMETALLICS 26.18(2007):4575-4584.