Highly 3,4-Selective Polymerization of Isoprene with NPN Ligand Stabilized Rare-Earth Metal Bis(alkyl)s. Structures and Performances

	Highly 3,4-Selective Polymerization of Isoprene with NPN Ligand Stabilized Rare-Earth Metal Bis(alkyl)s. Structures and Performances
	Li SH ; Cui DM ; Li DF ; Hou ZM
刊名	organometallics
	2009
卷号	28 期号:16 页码:4814-4822
关键词	N-HETEROCYCLIC CARBENE STEREOSPECIFIC POLYMERIZATION IMINOPHOSPHONAMIDE COMPLEXES 1 BUTADIENE POLYMERIZATION CATALYSTS COPOLYMERIZATION ALKYL STYRENE BEARING 3-DIENE POLYMERIZATION
ISSN号	0276-7333
通讯作者	cui dm
中文摘要	deprotonation of (arnhpph2nar2)-n-1 (h[npn](n), n = 1 - 10) by ln(ch2sime3)(3)(thf)(2) (ln = lu, y, sc, er) generated a series of rare-earth metal bis(alkyl) complexes [npn](n)ln(ch2sime3)(2)(thf)(2) (1-10), which under activation with [ph3c][b(c6f5)(4)] and alibu(3) were tested for isoprene polymerization. the correlation between catalytic performances and molecular structures of the complexes has been investigated. complexes 1-5 and 8, where ar-1 is nonsubstituted or ortho-alkyl-substituted phenyl, adopt trigonal-bipyramidal geometry. the ar-1 and ar-2 rings are perpendicular in 1-4 and 8 but parallel in 5. when ar-1 is pyridyl, the resultant lutetium and yttrium complexes 9a and 9b adopt tetragonal geometry with the ligand coordinating to the metal ions in a n,n,n-tridentate mode, whereas in the scandium analogue 9c, the ligand coordinates to the sc3+ ion in a n,n-bidentate mode. these structural characteristics endow the complexes with versatile catalytic performances, with increase of the steric bulkiness of the ortho-substituents ar-1 and ar-2, the 3,4-selectivity increased stepwise from 81.6% for lutetium complex 1 to 96.8% for lutetium complex 6 and to 97.8% for lutetium complex 7a. however, further increase of the steric bulk of the ligand led to a slight drop of 3,4-selectivity for the attached complex 5 (95.1%).
收录类别	SCI
语种	英语
WOS记录号	WOS:000268934400025
公开日期	2010-05-27
内容类型	期刊论文
源URL	[http://202.98.16.49/handle/322003/12359]
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 SH,Cui DM,Li DF,et al. Highly 3,4-Selective Polymerization of Isoprene with NPN Ligand Stabilized Rare-Earth Metal Bis(alkyl)s. Structures and Performances[J]. organometallics,2009,28(16):4814-4822.
APA	Li SH,Cui DM,Li DF,&Hou ZM.(2009).Highly 3,4-Selective Polymerization of Isoprene with NPN Ligand Stabilized Rare-Earth Metal Bis(alkyl)s. Structures and Performances.organometallics,28(16),4814-4822.
MLA	Li SH,et al."Highly 3,4-Selective Polymerization of Isoprene with NPN Ligand Stabilized Rare-Earth Metal Bis(alkyl)s. Structures and Performances".organometallics 28.16(2009):4814-4822.