Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (03): 273-277.doi: 10.3866/PKU.WHXB20000316

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Ligand and Anion Effects of Palladium Catalyst for CO/Ethylene Copolymerization

Luo He-Kuan, Li Da-Gang, Kou Yuan   

  1. Beijing Research Institute of Chemical Industry,Beijing 100013|Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000;College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1999-06-24 Revised:1999-10-18 Published:2000-03-15
  • Contact: Luo He-Kuan

Abstract:

Six complexes of two series were studied as the catalyst precursors for CO/ethylene copolymerization by using catalytic evaluation method and EXAFS technique. The first series of the complexes has general formular (L)Pd(OCOCF3)2 in which L is DPPPr, DPPBu or DPPEt. The second series of the complexes has general formular (DPPPr)Pd(A)2 in which A-is CF3COO-,P-CH3PhSO3-,Cl-or CH3COO-.The results showed that suitable ligands have relatively strong coordination ability to palladium(Ⅱ) center. Suitable anoins belonging to strong acids, have excellent stability on cationic palladium(Ⅱ),and easy to leave away to give coordination vacant to comonomers.

Key words: Carbon monoxide, Ethylene, Polyketone, Palladium(II) catalyst, EXAFS