Synthesis, characterization and ethylene polymerization behaviour of binuclear nickel halides bearing 4,5,9,10-tetra(arylimino)pyrenylidenes

Xing, Qifeng; Song, Kuifeng; Liang, Tongling; Liu, Qingbin; Sun, Wen-Hua; Redshaw, Carl

Abstract

Pyrene-4,5,9,10-tetraone was prepared via the oxidation of pyrene, and reacted with various anilines to afford a series of 4,5,9,10-tetra(arylimino)pyrenylidene derivatives (L1–L4). The tetraimino-pyrene compounds L1 and L2 were reacted with two equivalents of (DME)NiBr₂ in CH₂Cl₂ to afford the corresponding dinickel bromide complexes (Ni1 and Ni2). The organic compounds were fully characterized, whilst the bi-metallic complexes were characterized by FT-IR spectra and elemental analysis. The molecular structures of representative organic and nickel compounds were confirmed by single-crystal X-ray diffraction studies. These nickel complexes exhibited high activities towards ethylene polymerization in the presence of either MAO or Me₂AlCl, maintaining a high activity over a prolonged period (longer than previously reported dinickel complex pre-catalysts). The polyethylene obtained was characterized by GPC, DSC and FT-IR spectroscopy and was found to possess branched features.

Citation

Xing, Q., Song, K., Liang, T., Liu, Q., Sun, W., & Redshaw, C. (2014). Synthesis, characterization and ethylene polymerization behaviour of binuclear nickel halides bearing 4,5,9,10-tetra(arylimino)pyrenylidenes. Dalton Transactions : an international journal of inorganic chemistry, 43(21), 7830-7837. https://doi.org/10.1039/c4dt00503a

• Journal Article Type: Article
• Acceptance Date: Mar 28, 2014
• Online Publication Date: Mar 28, 2014
• Publication Date: Jun 7, 2014
• Deposit Date: Jun 9, 2015
• Publicly Available Date: Jun 9, 2015
• Journal: Dalton transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 21
• Pages: 7830-7837
• DOI: https://doi.org/10.1039/c4dt00503a
• Keywords: Ethylene polymerization; Binuclear nickel halides
• Public URL: https://hull-repository.worktribe.com/output/374925
• Publisher URL: http://pubs.rsc.org/en/Content/ArticleLanding/2014/DT/c4dt00503a#!divAbstract
• Additional Information: Author's accepted manuscript of article published in: Dalton transactions, 2014, v.43, issue 21.