Issue 31, 2012
From the journal:

Dalton Transactions

Metal (Mg, Fe, Co, Zr and Ti) complexes derived from aminosilyl substituted aminopyridinato ligand: synthesis, structures and ethylenepolymerization behaviors of the group 4 complexes†

Xin-E Duan,a   Shi-Fang Yuan,b   Hong-Bo Tong,b   Sheng-Di Bai,b   Xue-Hong Weia  and  Dian-Sheng Liu*b  

* Corresponding authors

a School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, P. R. China
E-mail: duanxe@sxu.edu.cn
Fax: +86 351 7011688
Tel: +86 351 7010722

b Institute of Applied Chemistry, Shanxi University, Taiyuan, 030006, P. R. China
E-mail: dsliu@sxu.edu.cn
Fax: +86 351 7011688
Tel: +86 351 7010722

Abstract

Lithium N-[(N,N-dimethylamino)dimethylsilyl]-2-pyridylamidate (2) was prepared from the reaction of new compound N-[(N,N-dimethylamino)dimethylsilyl]-2-pyridylamine (1) and LiBun. Treatment of the lithium salt (2) with an equal equivalent of MgBr2(THF)2, FeCl2 and CoCl2 afforded the corresponding dinuclear complexes 3, 4, and 5, in which metal atoms possess similar trigonal bipyramidal geometries and each ligand functions as a bimetallic bridging binding aminopyridinato moiety with N-donation from the dimethylamino group. While the stoichiometric reaction of 2 with ZrCl4 gave the mononuclear zirconium complex (6); the seven coordinated zirconium atom adopts a distorted pentagonal bipyramid geometry and the ligand acts as monoanionic η2-aminopyridinato moiety with the pendant arm coordinated via N(CH3)2. The reaction of 2 with one equivalent of TiCl4(THF)2 produced the interesting dinuclear titanium complex (7) owing to the elimination of a (N,N-dimethylamino)dimethylsilyl group from the original ligand, and the two titanium centers present different coordination geometries. The molecular structures of the crystalline metal complexes 3–7 have been confirmed by X-ray single crystal diffraction analysis. Upon activation with methylaluminoxane (MAO), both complexes 6 and 7 exhibited moderate catalytic activities toward ethylene polymerization and produced high molecular weight polyethylenes with broad molecular weight distributions.

Graphical abstract: Metal (Mg, Fe, Co, Zr and Ti) complexes derived from aminosilyl substituted aminopyridinato ligand: synthesis, structures and ethylene polymerization behaviors of the group 4 complexes

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/C2DT30463E
Article type
Paper
Submitted
27 Feb 2012
Accepted
29 May 2012
First published
30 May 2012

Dalton Trans., 2012,41, 9460-9467

Permissions

Request permissions

Metal (Mg, Fe, Co, Zr and Ti) complexes derived from aminosilyl substituted aminopyridinato ligand: synthesis, structures and ethylene polymerization behaviors of the group 4 complexes

X. Duan, S. Yuan, H. Tong, S. Bai, X. Wei and D. Liu, Dalton Trans., 2012, 41, 9460 DOI: 10.1039/C2DT30463E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements