Issue 25, 2013
From the journal:

Dalton Transactions

Nickel(ii) complexes bearing 4,5-bis(arylimino)pyrenylidenes: synthesis, characterization, and ethylenepolymerization behaviour†

Kuifeng Song,ab   Wenhong Yang,b   Baixiang Li,c   Qingbin Liu,*a   Carl Redshaw,*d   Yuesheng Lic  and  Wen-Hua Sun*b  

* Corresponding authors

a Institute of Chemistry and Chemical Engineering, Hebei Normal University, Shijiazhuang 050091, China
E-mail: liuqingb@heinfo.net
Fax: +86 (10) 80787432
Tel: +86 (10) 80787432

b Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
E-mail: whsun@iccas.ac.cn
Fax: +86 (10) 62618239
Tel: +86 (10) 62557955

c State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

d Department of Chemistry, University of Hull, Hull, UK
E-mail: c.redshaw@hull.ac.uk
Fax: +44 (0) 1482 466410
Tel: +44 (0) 1482 465219

Abstract

A series of nickel(II) dihalides complexes bearing 4,5-bis(arylimino)pyrenylidenes, NiX2(2,6-R1-4-R2C6H2N)2C16H8, was synthesized and characterized by FT-IR spectroscopy, elemental analysis, and single crystal X-ray diffraction for the organic compounds (L2 and L3) and the nickel complexes (C1 and C2). The molecular structures of C1 (R1 = Me, R2 = H, X = Br) and C2 (R1 = R2 = Me, X = Br) revealed a distorted tetrahedral geometry around the nickel centre. Upon treatment with the co-catalysts MAO, EASC and MMAO, all the nickel pre-catalysts exhibited high activities (of up to 4.42 × 106 g(PE) mol(Ni)−1 h−1) for ethylene polymerization, and produced polyethylene products with a high degree of branching (up to 130 branched per 1000 carbons) and narrow molecular weight distribution. The influence of the reaction parameters and the nature of the ligands on the catalytic behavior of the title nickel complexes have been investigated.

Graphical abstract: Nickel(ii) complexes bearing 4,5-bis(arylimino)pyrenylidenes: synthesis, characterization, and ethylene polymerization behaviour

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Article information

DOI
https://doi.org/10.1039/C2DT32343E
Article type
Paper
Submitted
04 Oct 2012
Accepted
23 Nov 2012
First published
23 Nov 2012

Dalton Trans., 2013,42, 9166-9175

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Nickel(II) complexes bearing 4,5-bis(arylimino)pyrenylidenes: synthesis, characterization, and ethylene polymerization behaviour

K. Song, W. Yang, B. Li, Q. Liu, C. Redshaw, Y. Li and W. Sun, Dalton Trans., 2013, 42, 9166 DOI: 10.1039/C2DT32343E

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