Chinese Journal of Polymer Science

, Volume 37, Issue 10, pp 974–980 | Cite as

A Phenol-containing α-Diimine Ligand for Nickel- and Palladium-Catalyzed Ethylene Polymerization

  • Chen Tan
  • Wen-Min Pang
  • Chang-Le ChenEmail author


A phenol-containing dibenzhydryl-based α-diimine ligand bearing hydroxy group on para-position of aniline moiety was designed, synthesized, and investigated in Ni- and Pd-catalyzed ethylene polymerization. The Ni complex bearing hydroxy groups resulted in not only high polyethylene molecular weight (Mn up to 1.5 × 106), but also significantly increased melting temperature (Tm up to 123 °C) and greatly decreased branching density (33/1000C) versus the Ni catalyst bearing OMe group on para-position of aniline moiety. This is consistent with the hypothesis that the deprotonation of the phenol moiety generated a phenoxide bearing strong electrondonating O substituent by methylaluminoxane (MAO) cocatalyst. The Pd complexes bearing hydroxy groups exhibited similar catalytic properties to those of the Pd catalyst bearing OMe groups did.


α-Diimine Ethylene polymerization Electronic effect Palladium Nickel 


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This work was financially supported by the National Natural Science Foundation of China (No. 21690071).

Supplementary material

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A Phenol-containing α-Diimine Ligand for Nickel- and Palladium- Catalyzed Ethylene Polymerization


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Copyright information

© Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefeiChina

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