Highly active nickel(II) and palladium(II) complexes bearing N,N,P tridentate ligand for vinyl addition polymerization of norbornene

Rui Zhuang, Heng Liu, Jun Guo, Bo Dong, Wenpeng Zhao, Yanming Hu, Xuequan Zhang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A series of nickel (II) complexes (1a-4a) and palladium (II) complexes (1b-4b) bearing N,N,P tridentate ligands derived from amino-alkyl phosphines and 2-pyridinecarboxaldehyde and 2-quinolinecarboxaldehyde were synthesized and characterized. X-ray diffraction analysis revealed that complexes 1a, 4a, and 2b adopted square-pyramidal geometry, trigonal bipyramid, and distorted square-planar geometry, respectively. Activated by methylaluminoxane (MAO), all the complexes were highly active for norbornene polymerization in a vinyl addition fashion, affording high molecular weight polymers with narrow molecular weight distributions. The activities of palladium complexes are particularly notable; the highest activity reached 2.45 × 108 g PNB (mol of Ni)−1 h−1. The activities of the complexes were affected by the ligand structure as well as the reaction parameters such as polymerization temperature, time, and cocatalyst loading.

Original languageEnglish (US)
Pages (from-to)358-367
Number of pages10
JournalEuropean Polymer Journal
Volume93
DOIs
StatePublished - Aug 2017

Keywords

  • Nickel
  • Norbornene
  • Palladium
  • Transition-metal catalysts
  • Vinyl polymerization

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