NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene

	NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene
	Wang LF ; Liu DT ; Cui DM
刊名	organometallics
	2012
卷号	31 期号:17 页码:6014-6021
关键词	RING-OPENING POLYMERIZATION LANTHANIDE ALKYL COMPLEXES STYRENE POLYMERIZATION ZIRCONIUM COMPLEXES ETHYLENE POLYMERIZATION LACTIDE POLYMERIZATION HYDROCARBYL COMPLEXES OLEFIN POLYMERIZATION EPSILON-CAPROLACTONE YTTRIUM COMPLEXES
ISSN号	0276-7333
通讯作者	cui dm
中文摘要	the acid base reactions of nnn-tridentate pyrrolyl ligands (hl1: 2,5-bis((pyrrolidin-1-yl)methylene)-1h-pyrrole; hl2: 2,5-bis((piperidino)methylene)-1h-pyrrole) with rare-earth metal tris(alkyl)s, ln(ch2sime3)(3)(thf)(2), afforded the corresponding bis(alkyl) complexes l(1)ln(ch2sime3)(2)(thf)(x) (ln = sc, x = 0 (1a); ln = y, x = 1 (1b); ln = lu, x = 1 (1c)), (lsc)-sc-2(ch2sime3)(2) (2a), and l(2)(2)ln(2)(ch2sime3)(4) (ln = y (2b); lu (2c)) in moderate to high yields. x-ray diffraction analysis revealed that the scandium complexes 1a and 2a are thf solvent-free monomers where the ligands coordinate to the sc3+ ion in a kappa(1):kappa(2) mode, while the yttrium and lutetium complexes 1b and 1c have the same ligand coordination geometry to that of the scandium complex but are one-thf solvates; complex 2b, however, is a dimer bridged by two anionic l-2 fragments that coordinate to the two yttrium ions in mixed eta(5):eta(5)/kappa(1):kappa(1) coordination modes. upon activation with an organoborate, all these complexes initiated the controlled polymerization of isoprene. in general, complexes 2a-c, bearing ligand l-2, exhibited higher activity than the analogous complexes 1a-c, attached to the l-1 ligand, complex 2b, in which the l-2 ligand adopts the mixed eta(5)/kappa(1) coordination mode, showed the highest activity and livingness mode toward the polymerization of isoprene with high cis-1,4-selectivity (94.1%), and both scandium complexes 1a and 2a exhibited high 3,4-selectivity (87%) irrespective of the ligand type; in contrast, the lutetium complexes initiated the atactic isoprene polymerization. the influences of thell ligand structural factors, the coordination solvent, and the central metal ion on the catalytic activity and selectivity are discussed.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000308513000011
公开日期	2013-04-23
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/47950]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Wang LF,Liu DT,Cui DM. NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene[J]. organometallics,2012,31(17):6014-6021.
APA	Wang LF,Liu DT,&Cui DM.(2012).NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene.organometallics,31(17),6014-6021.
MLA	Wang LF,et al."NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene".organometallics 31.17(2012):6014-6021.