Highly cis-1,4 selective polymerization of dienes with homogeneous Ziegler-Natta catalysts based on NCN-pincer rare earth metal dichioride precursors | |
Gao, Wei1,2; Cui, Dongmei1 | |
刊名 | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY |
2008-04-09 | |
卷号 | 130期号:14页码:4984-4991 |
ISSN号 | 0002-7863 |
DOI | 10.1021/ja711146t |
英文摘要 | The first aryldiimine NCN-pincer ligated rare earth metal dichlorides (2,6-(2,6-C(6)H(3)R(2)N=CH)(2)C(6)H(3))LnCl(2)(THF)(2) (Ln = Y, R = Me (1), Et (2), Pr (3); R = Et, Ln = La (4), Nd (5), Gd (6), Sm (7), Eu (8), Tb (9), Dy (10), Ho (11), Yb (12), Lu (13)) were successfully synthesized via transmetalation between 2,6-(2,6-C(2)H(3)-R(2)N=CH)(2)-C(6)H(3)Li and LnCl(3)(THF)(1 similar to 3.5). These complexes are isostructural monomers with two coordinating THF molecules, where the pincer ligand coordinates to the central metal ion in a kappa C:kappa N: kappa N' tridentate mode, adopting a meridional geometry. Complexes 1-6, 9-11, and 13 combined with aluminum tris(alkyl)s and [Ph(3)C][B(C(6)F(5))(4)] established a homogeneous Ziegler-Natta catalyst system, which exhibited high activities and excellent cis-1,4 selectivities for the polymerizations of butadiene (T(p) = 25 degrees C, 99.9%; 0 degrees C, 100%) and isoprene (T(p) = 25 degrees C, 98.8%). Remarkably, such high cis-1,4 selectivity almost remained at elevated polymerization temperatures up to 80 degrees C and did not vary with the type of the central lanthanide element, however, which was influenced obviously by the ortho substituent of the N-aryl ring of the ligands and the bulkiness of the aluminum alkyls. The Ln-Al bimetallic cations were considered as the active species. These results shed new light on improving the catalytic performance of the conventional Ziegler-Natta catalysts for the specific selective polymerization of dienes. |
语种 | 英语 |
出版者 | AMER CHEMICAL SOC |
WOS记录号 | WOS:000254643900054 |
内容类型 | 期刊论文 |
源URL | [http://ir.iccas.ac.cn/handle/121111/63471] |
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.Jilin Univ, Sch Chem, Changchun 130012, Peoples R China |
推荐引用方式 GB/T 7714 | Gao, Wei,Cui, Dongmei. Highly cis-1,4 selective polymerization of dienes with homogeneous Ziegler-Natta catalysts based on NCN-pincer rare earth metal dichioride precursors[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2008,130(14):4984-4991. |
APA | Gao, Wei,&Cui, Dongmei.(2008).Highly cis-1,4 selective polymerization of dienes with homogeneous Ziegler-Natta catalysts based on NCN-pincer rare earth metal dichioride precursors.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,130(14),4984-4991. |
MLA | Gao, Wei,et al."Highly cis-1,4 selective polymerization of dienes with homogeneous Ziegler-Natta catalysts based on NCN-pincer rare earth metal dichioride precursors".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 130.14(2008):4984-4991. |
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