Binuclear Rare-Earth-Metal Alkyl Complexes Ligated by Phenylene-Bridged beta-Diketiminate Ligands: Synthesis, Characterization, and Catalysis toward Isoprene Polymerization

	Binuclear Rare-Earth-Metal Alkyl Complexes Ligated by Phenylene-Bridged beta-Diketiminate Ligands: Synthesis, Characterization, and Catalysis toward Isoprene Polymerization
	Li L ; Wu CJ ; Liu DT ; Li SH ; Cui DM
刊名	organometallics
	2013
卷号	32 期号:11 页码:3203-3209
关键词	RING-OPENING POLYMERIZATION LANTHANIDE AMIDO COMPLEXES H BOND ACTIVATION ETHYLENE-POLYMERIZATION OLEFIN POLYMERIZATION MOLECULAR-WEIGHT L-LACTIDE STEREOSPECIFIC POLYMERIZATION ORGANOLANTHANIDE COMPLEXES SELECTIVE POLYMERIZATION
ISSN号	0276-7333
通讯作者	li sh
中文摘要	deprotonation of m-phenylene-bridged bis(beta-diketiminate) ligands (pbdiipr-h-2 = [2,6-(pr2c6h3nhc)-pr-i(me)c(h)c(me)n](2)-(m-phenylene); pbdiet-h-2 = [2,6-et2c6h3nhc(me)c(h)c(me)n](2)-(m-phenylene); pbdime-h-2 = [2,6-me2c6h3nhc(me)c(h)c(me)n](2)-(m-phenylene)) by rare-earth-metal tris(alkyls) ln(ch2sime3)(3)(thf)(2) (ln = y, lu, sc) gave a series of rare-earth-metal bis(alkyl) complexes: pbdiipr-[y(ch2sime3)(2)](2)(thf)(2) (1), pbdiet-[ln(ch2sime3)(2)](2)(thf)(n) (2a, ln = y, n = 2; 2b, ln = lu, n = 2; 2c, ln = sc, n = 1), and pbdime-[y(ch2sime3)(2)](2)(thf)(2) (3). all these complexes were fully characterized by nmr spectroscopy, x-ray diffraction, and elemental analyses, adopting binuclear structures with the two rare-earth-metal ions taking trans positions versus the phenyl ring. complexes 1, 2a,b, and 3 coordinate two solvated thf molecules, while the scandium complex 2c incorporates only one thf molecule, owing to the steric crowding. upon activation with 2 equiv of organoborate, the yttrium systems showed higher catalytic activity toward isoprene polymerization in comparison to those based on lutetium, and the scandium system was less active. addition of aluminum alkyls to the above binary systems accelerated dramatically the polymerization rate irrespective of the central metal type through scavenging impurities in the systems and abstracting the solvated thf molecules in the precursors. the resultant polyisoprene had higher 3,4-regularity (20% vs 5%) as well as higher molecular weights in comparison with the mononuclear systems, which might be attributed to the steric bulky effect of the binuclear systems.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000320356200011
公开日期	2014-04-15
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/49800]
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	Li L,Wu CJ,Liu DT,et al. Binuclear Rare-Earth-Metal Alkyl Complexes Ligated by Phenylene-Bridged beta-Diketiminate Ligands: Synthesis, Characterization, and Catalysis toward Isoprene Polymerization[J]. organometallics,2013,32(11):3203-3209.
APA	Li L,Wu CJ,Liu DT,Li SH,&Cui DM.(2013).Binuclear Rare-Earth-Metal Alkyl Complexes Ligated by Phenylene-Bridged beta-Diketiminate Ligands: Synthesis, Characterization, and Catalysis toward Isoprene Polymerization.organometallics,32(11),3203-3209.
MLA	Li L,et al."Binuclear Rare-Earth-Metal Alkyl Complexes Ligated by Phenylene-Bridged beta-Diketiminate Ligands: Synthesis, Characterization, and Catalysis toward Isoprene Polymerization".organometallics 32.11(2013):3203-3209.