2,6-Dibenzhydryl-N-(2-Phenyliminoacenaphthylenylidene)-4-Chloro-Aniline Nickel Dihalides: Synthesis, Characterization and Ethylene Polymerization for Polyethylenes with High Molecular Weights
A series of 2,6-dibenzhydryl-N-(2-phenyliminoacenaphthylenylidene)-4- chloroanilines (L1-L5) and their nickel halide complexes LNiX (X = Br, C1-C5; X = Cl, C6-C10) were synthesized. All organic compounds were characterized by FT-IR and NMR spectroscopy and elemental analysis. The nickel complexes were characterized by FT-IR spectroscopy, elemental analysis and their structures were determined by single-crystal X-ray diffraction. Upon activation with MAO, all of these nickel complexes showed high activities (up to 10 7 g of PE (mol of Ni)-1 h-1) for ethylene polymerization. The resulting polyethylenes possess high molecular weights (Mw up to 106 g mol-1) and feature high degrees of branching. The MM-QEq method was employed to assess the ligands' effects on catalytic activities. The results show that higher net charges on the nickel core correlate directly with higher measured activities.
S. Kong et al., "2,6-Dibenzhydryl-N-(2-Phenyliminoacenaphthylenylidene)-4-Chloro-Aniline Nickel Dihalides: Synthesis, Characterization and Ethylene Polymerization for Polyethylenes with High Molecular Weights," Journal of Organometallic Chemistry, vol. 725, pp. 37 - 45, Elsevier, Feb 2013.
The definitive version is available at https://doi.org/10.1016/j.jorganchem.2012.12.009
National Natural Science Foundation (China)
Keywords and Phrases
Dihalides; Ethylene Polymerization; FTIR Spectroscopy; High Activity; High Branching; High Molecular Weight; Net Charges; Nickel Complex; Nickel Halides; Single Crystal X-Ray Diffraction; Theoretical Calculations; Ethylene; Molecular Weight; Nuclear Magnetic Resonance Spectroscopy; Polyethylenes; Polymerization; Thermoplastics; X Ray Diffraction; Nickel; [alpha]-Diimine Nickel Complex
International Standard Serial Number (ISSN)
Article - Journal
© 2013 Elsevier, All rights reserved.
01 Feb 2013
This work was supported by the National Natural Science Foundation of China (No. 20874105 ) and the President Fund of GUCAS.