Ferrous and Cobaltous Chlorides Bearing 2,8-Bis(imino)quinolines: Highly Active Catalysts for Ethylene Polymerization at High Temperature

Ferrous and Cobaltous Chlorides Bearing 2,8-Bis(imino)quinolines: Highly Active Catalysts for Ethylene Polymerization at High Temperature

A series of 2,8-bis(1-aryliminoethyl)quinolines [2,8-(2,6-R1 2-4-R2C6H2NCCH3)2C9H5N (L), R1 = Me, Et, or i-Pr, R2 = H or Me] is synthesized and used in the reaction with ferrous or cobaltous chlorides. The corresponding complexes LMCl2 are limitedly formed with ligands containing ortho-methyl group...

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Veröffentlicht in:Organometallics 2010-03, Vol.29 (5), p.1168-1173
Hauptverfasser: Zhang, Shu, Sun, Wen-Hua, Xiao, Tianpengfei, Hao, Xiang
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container_title Organometallics
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creator Zhang, Shu
Sun, Wen-Hua
Xiao, Tianpengfei
Hao, Xiang
description A series of 2,8-bis(1-aryliminoethyl)quinolines [2,8-(2,6-R1 2-4-R2C6H2NCCH3)2C9H5N (L), R1 = Me, Et, or i-Pr, R2 = H or Me] is synthesized and used in the reaction with ferrous or cobaltous chlorides. The corresponding complexes LMCl2 are limitedly formed with ligands containing ortho-methyl groups of the imino phenyl rings (R = H, M = Fe (Fe1), M = Co (Co1); R = Me, M = Fe (Fe2), M = Co (Co2). The X-ray diffraction study reveals a distorted pyramidal geometry of Co1 around the cobalt atom. These complexes, activated with methylaluminoxane (MAO), show unique properties toward ethylene polymerization: no activity observed at low temperature, but high activity achieved at temperatures higher than 80 °C (up to 7.61 × 106 g·mol−1·h−1 at 100 °C). Moreover, the polyethylenes obtained are high molecular weight with narrow molecular distribution. This is the first example of iron and cobalt procatalysts with high activity for ethylene polymerization at high temperature.
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title Ferrous and Cobaltous Chlorides Bearing 2,8-Bis(imino)quinolines: Highly Active Catalysts for Ethylene Polymerization at High Temperature
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