Synthesis of linked half sandwich rare-earth metal chlorido and borohydrido complexes and their catalytic behavior towards MMA polymerization
文献类型：期刊论文
| 作者 | Jian, Zhongbao1,2; Zhao, Wei1,2; Liu, Xinli1; Chen, Xuesi1; Tang, Tao1; Cui, Dongmei1 |
| 刊名 | DALTON TRANSACTIONS
 |
| 出版日期 | 2010 |
| 卷号 | 39期号:29页码:6871-6876 |
| ISSN号 | 1477-9226 |
| DOI | 10.1039/c001824d |
| 英文摘要 | A series of rare-earth metal complexes attached by an amino-functionalized cyclopentadienyl ligand (C(5)Me(4)H-C(6)H(4)-o-NMe(2)) (1) was prepared. The metathesis reaction of the ligand lithium salt [C(5)Me(4)H-C(6)H(4)-o-NMe(2)]Li with LnCl(3)(THF)(n) afforded the dichlorido complexes [(C(5)Me(4)H-C(6)H(4)-o-NMe(2))(2)Ln(2)Cl(4)][LiCl(THF)(2)] (Ln = Y (2a), Lu (2b)), which are trinuclear connected by mu(3)-Cl and mu(2)-Cl multiple bridges. The straightforward metathesis reaction of Ln(BH(4))(3)(THF)(n) with equimolar [C(5)Me(4)H-C(6)H(4)-o-NMe(2)]Li in THF medium yielded the first linked half sandwich ligand stabilized THF-free rare-earth metal bis(borohydrido) complexes (C(5)Me(4)H-C(6)H(4)-o-NMe(2))Ln(BH(4))(2) (Ln = Sc (3a), Sm (3b)), respectively. The single component borohydrido complex 3a showed high activity towards the bulk polymerization of methyl methacrylate without specific control, which showed high iso-selectivity (mm = 80%) when the polymerization was performed in benzene medium, and switched to syndio-selectivity (rr = 74% at -20 degrees C) in polar THF medium, whilst the metal chlorido species was inert. The binary catalyst system of 3a/Mg(n)Bu(2) had similar catalytic performances when compared with 3a in THF medium, but provided enriched syndio-control in benzene solution that was in contrast to the iso-control of 3a. Surprisingly, 3a upon activation with (n)BuLi displayed an extremely high activity (1.1 x 10(6) g mol(Sc)(-1) h(-1)) and afforded syndiotactic PMMA (rr = 75%) at low polymerization temperature (-20 degrees C) in THF. |
| 语种 | 英语 |
| WOS记录号 | WOS:000279913100040 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/68833]  |
| 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 | Jian, Zhongbao,Zhao, Wei,Liu, Xinli,et al. Synthesis of linked half sandwich rare-earth metal chlorido and borohydrido complexes and their catalytic behavior towards MMA polymerization[J]. DALTON TRANSACTIONS,2010,39(29):6871-6876. |
| APA | Jian, Zhongbao,Zhao, Wei,Liu, Xinli,Chen, Xuesi,Tang, Tao,&Cui, Dongmei.(2010).Synthesis of linked half sandwich rare-earth metal chlorido and borohydrido complexes and their catalytic behavior towards MMA polymerization.DALTON TRANSACTIONS,39(29),6871-6876. |
| MLA | Jian, Zhongbao,et al."Synthesis of linked half sandwich rare-earth metal chlorido and borohydrido complexes and their catalytic behavior towards MMA polymerization".DALTON TRANSACTIONS 39.29(2010):6871-6876. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。