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2-(1-(2-Benzhydrylnaphthylimino)ethyl)pyridylnickel halides: Synthesis, characterization, and ethylene polymerization behavior

Yue, Erlin; Zhang, Liping; Xing, Qifeng; Cao, Xiao-Ping; Hao, Xiang; Redshaw, Carl; Sun, Wen-Hua

Authors

Erlin Yue

Liping Zhang

Qifeng Xing

Xiao-Ping Cao

Xiang Hao

Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Wen-Hua Sun

Abstract

A series of 2-(1-(2-benzhydrylnaphthylimino)ethyl)pyridine derivatives (L1–L3) was synthesized and fully characterized. The organic compounds acted as bi-dentate ligands on reacting with nickel halides to afford two kinds of nickel complexes, either mononuclear bis-ligated L₂NiBr₂ (Ni1–Ni3) or chloro-bridged dinuclear L₂Ni₂Cl₄ (Ni4–Ni6) complexes. The nickel complexes were fully characterized, and the single crystal X-ray diffraction revealed for Ni2, a distorted square pyramidal geometry at nickel comprising four nitrogens of two ligands and one bromide; whereas for Ni4, a centrosymmetric dimer possessing a distorted octahedral geometry at nickel was formed by two nitrogens of one ligand, two bridging chlorides and one terminal chloride along with oxygen from methanol (solvent). When activated with diethylaluminium chloride (Et₂AlCl), all nickel complexes performed with high activities (up to 1.22 × 10⁷ g (PE) mol⁻¹(Ni) h⁻¹) towards ethylene polymerization; the obtained polyethylene possessed high branching, low molecular weight and narrow polydispersity, suggestive of a single-site active species. The effect of the polymerization parameters, including the nature of the ligands/halides on the catalytic performance is discussed.

Journal Article Type Article
Publication Date Jan 14, 2014
Journal Dalton transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 43
Issue 2
Pages 423-431
Institution Citation Yue, E., Zhang, L., Xing, Q., Cao, X., Hao, X., Redshaw, C., & Sun, W. (2014). 2-(1-(2-Benzhydrylnaphthylimino)ethyl)pyridylnickel halides: Synthesis, characterization, and ethylene polymerization behavior. Dalton transactions : an international journal of inorganic chemistry / RSoC, 43(2), 423-431. doi:10.1039/c3dt52234b
DOI https://doi.org/10.1039/c3dt52234b
Keywords Ethylene polymerization; Nickel complexes; Polyethylene
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2014/dt/c3dt52234b#!divAbstract
Copyright Statement This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

©2014, The Royal Society of Chemistry
Additional Information Copy of article first published in: Dalton transactions, 2014, v.43, issue 2.

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Copyright Statement
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

©2014, The Royal Society of Chemistry



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