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Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene

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Abstract

A series of nickel complexes {NOONR}Ni(A: R=Me; B: R=t-Bu; C: R=OMe) based on salicylalde-hyde-imine ligands was synthesized through Schiff base condensation and metal complexation reaction. Upon activa-tion with methylaluminoxane(MAO), nickel complexes A―C all exhibited good catalytic activity([turnover fre-quency=5.2×105―16.3×105 g/(mol Ni h)] and oligomer selectivity(above 85%, mass fraction) in ethylene oligomerization. In addition, C8―C12 olefins occupied an important proportion in the products of oligomers. Under the conditions of 4.0 MPa, 25 °C and Al/Ni molar ratio of 275, the catalytic selectivity of A/MAO system toward C8―C12 was about 30.1%(mass fraction), and the content of C8―C12 α-olefins was consistently above 70%. Furthermore, besides the ligand environment, the catalytic properties of A―C were substantially affected by experimental parameters, such as the reaction pressure, reaction temperature and Al/Ni ratio.

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Authors and Affiliations

  1. Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318, P. R. China

    Liduo Chen, Junyi Xie & Jun Wang

  2. Daqing Chemical Research Center of Petrochina Petrochemical Research Institute, Daqing, 163714, P. R. China

    Hongliang Huo, Libo Wang, Lili Ma & Yan Jiang

Authors
  1. Liduo Chen
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  2. Hongliang Huo
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  3. Libo Wang
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  4. Lili Ma
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  5. Yan Jiang
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  6. Junyi Xie
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  7. Jun Wang
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Corresponding author

Correspondence to Jun Wang.

Additional information

Supported by the National Key R&D Program of China(No.2017YFB0306701).

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Chen, L., Huo, H., Wang, L. et al. Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene. Chem. Res. Chin. Univ. 34, 945–951 (2018). https://doi.org/10.1007/s40242-018-8186-y

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  • DOI: https://doi.org/10.1007/s40242-018-8186-y

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