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Issue 31, 2012

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

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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

Supplementary files

Article information


Submitted
27 Feb 2012
Accepted
29 May 2012
First published
30 May 2012

Dalton Trans., 2012,41, 9460-9467
Article type
Paper

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

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