Accepted manuscript.pdf (876.88 kB)
Download file

Thermally stable and highly active cobalt precatalysts for vinyl-polyethylenes with narrow polydispersities: Integrating fused-ring and imino-carbon protection into ligand design

Download (876.88 kB)
journal contribution
posted on 24.02.2017, 16:50 by Fang Huang, Wenjuan Zhang, Yang Sun, Xinquan Hu, Gregory A. Solan, Wen-Hua Sun
A series of [2-(1-aryliminobenzylidene)-9-arylimino-5,6,7,8-tetrahydrocyclohepta[b]pyridyl]cobalt chlorides (aryl = 2,6-Me2Ph (Co1), 2,6-Et2Ph (Co2), 2,6-i-Pr2Ph (Co3), 2,4,6-Me3Ph (Co4), and 4-Me-2,6-Et2Ph (Co5)), incorporating a fused seven-membered ring and an imino C-phenyl group, was synthesized and characterized. Upon activation with methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), Co1-Co5 all showed high activities toward ethylene polymerization with the Co4/MAO system showing the highest activity (8.65 × 106 g(PE) mol-1(Co) h-1). Significantly, these systems exhibited good thermal stability (up to 80 °C) as well as long catalytic lifetimes. The polyethylenes obtained all contained vinyl end-groups as well as narrow polydispersities. These phenyl-modified cobalt precatalysts provide a functional system for generating a unique class of vinyl-polyethylenes due to their ease of preparation, high catalytic activities and thermally stable polymerization.

Funding

This work was supported by National Natural Science Foundation of China (Nos. U1362204, 51473170, 21473160 and 21374123). GAS thanks the Chinese Academy of Sciences for a Visiting Scientist Fellowship.

History

Citation

New Journal of Chemistry, 2016, 40 (9), pp. 8012-8023

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

AM (Accepted Manuscript)

Published in

New Journal of Chemistry

Publisher

Royal Society of Chemistry

issn

1144-0546

eissn

1369-9261

Acceptance date

26/07/2016

Copyright date

2016

Available date

27/07/2017

Publisher version

http://pubs.rsc.org/en/Content/ArticleLanding/2016/NJ/C6NJ01867J#!divAbstract

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en

Usage metrics

Categories

Keywords

Exports