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American Chemical Society, Organometallics, 3(31), p. 1143-1149, 2012

DOI: 10.1021/om201213v

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Vinyl Polymerization of Norbornene on Nickel Complexes with Bis(imino)pyridine Ligands Containing Electron-Withdrawing Groups

Journal article published in 2012 by Artem A. Antonov, Nina V. Semikolenova, Vladimir A. Zakharov, Wenjuan Zhang ORCID, Youhong Wang, Wen-Hua Sun ORCID, Evgenii P. Talsi, Konstantin P. Bryliakov
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This paper is available in a repository.

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Abstract

A series of novel bis(imino)pyridine nickel(II) dichloride complexes, with the bis(imino)pyridine ligands containing electron-withdrawing groups (F, Cl, Br, CF3), have been prepared and characterized by elemental analysis and NMR spectroscopy. All complexes exhibit paramagnetically shifted H-1 NMR spectra, indicative of the high-spin (S = 1) state of the d(8) nickel(II) central atom. These complexes have been found to be highly active catalysts of vinyl-type norbornene polymerization upon activation with MAO, displaying activities up to 1.16 X 10(7) g of PNB (mol of cat.)(-1) h(-1) (the highest ever reported for norbornene polymerizations on bis(imino)pyridine nickel complexes) and yielding high-molecular-weight polynorbornene (M-w up to 4.5 X 10(6)). X-ray structures for some of the nickel complexes are reported.