Ligands Dominate Highly Syndioselective Polymerization of Styrene by Using Constrained-geometry-configuration Rare-earth Metal Precursors

	Ligands Dominate Highly Syndioselective Polymerization of Styrene by Using Constrained-geometry-configuration Rare-earth Metal Precursors
	Pan YP ; Rong WF ; Jian ZB ; Cui DM
刊名	macromolecules
	2012
卷号	45 期号:3 页码:1248-1253
关键词	ALLYL ANSA-LANTHANIDOCENES HALF-SANDWICH COMPLEXES SYNDIOTACTIC POLYSTYRENE SYNDIOSPECIFIC STYRENE SINGLE-COMPONENT STEREOSELECTIVE POLYMERIZATION ANILIDO-PHOSPHINIMINE ANCILLARY LIGAND CATALYSTS COPOLYMERIZATION
ISSN号	0024-9297
通讯作者	cui dm
中文摘要	a series of novel constrained-geometry-configuration (cgc) rare-earth metal complexes (rch2-py)ln-(ch2sime3)(2)(thf)(n) (py = pyridyl; ln = y, n = 1, r = c5me4 (cp') (1); ln = y, n = 1, r = c9h6 (ind) (2); ln = y, n = 1, r = c13h8 (flu) (3a); ln = lu, n = 1, r = c13h8 (flu) (3b); ln = sc, n = 0, r = c13h8 (flu) (3c)) have been synthesized by treating rare-earth metal trisalkyls with pych2-cp', pych2-ind, and pych2-flu compounds, respectively, and fully characterized by nmr and x-ray diffraction analyses. complexes 1, 2, and 3a-b are monomeric thf solvates while the scandium complex 3c is solvent-free, in which all the cgc ligands adopt a eta(5)/kappa(1) bonding mode via coordination of five carbon atoms from the cyclopentadienyl fragment and the pyridyl nitrogen atom with the central metals. upon activation with (albu3)-bu-i and [ph3c][b(c6f5)(4)], these complexes showed different performances toward styrene polymerization. the cp'ch2-py and indch(2)-py ligated yttrium complexes 1 and 2 showed very low activity to afford syndiotactic enriched polystyrene. strikingly, the bulky fluch(2)-py supported complexes 3a-c displayed outstanding activities up to 1.56 x 10(7) g/(mol(ln).h) and perfect syndioselectivity (rrrr > 99%), giving high molecular weight sps; in particular, thus excellent performance was independent of the central metal type for the first time. in addition, the relationship of the ligand structure with the catalytic performances toward specific selective polymerization of styrene was reasonably revealed by comparison with the other flu-based rare-earth metal catalysts reported previously by us. this might open a new pathway for designing catalysts for specifically selective polymerizations.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000300124200014
公开日期	2013-06-08
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/48331]
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	Pan YP,Rong WF,Jian ZB,et al. Ligands Dominate Highly Syndioselective Polymerization of Styrene by Using Constrained-geometry-configuration Rare-earth Metal Precursors[J]. macromolecules,2012,45(3):1248-1253.
APA	Pan YP,Rong WF,Jian ZB,&Cui DM.(2012).Ligands Dominate Highly Syndioselective Polymerization of Styrene by Using Constrained-geometry-configuration Rare-earth Metal Precursors.macromolecules,45(3),1248-1253.
MLA	Pan YP,et al."Ligands Dominate Highly Syndioselective Polymerization of Styrene by Using Constrained-geometry-configuration Rare-earth Metal Precursors".macromolecules 45.3(2012):1248-1253.