Nickel(II) catalysed co-polymerisation of CO and ethene: Formation of polyketone vs. polyethylene - The role of co-catalysts

Udo Beckmann, Eva Eichberger, Anna Rufińska, Rafaël Sablong, Wolfgang Kläui

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The square planar Ni complex (SP-4-3)-[Ni(2-tol)(PPh3)(N,O)] (N,O = (Z)-4,4,5,5,6,6,6-heptafluoro-3-oxo-2-(pyrrolidine-2-ylidene)- hexanenitrile) is an active catalyst for the co-polymerisation of CO and ethene yielding aliphatic polyketone. Addition of Lewis acids like BPh3 or B(C6F5)3 as co-catalyst accelerates the polymerisation but not the lifetime of the catalyst and leads to a mixture of polyethylene and polyketone. Addition of the Lewis base triphenylphosphane (PPh3) completely suppresses the formation of polyethylene. The polymers formed were characterised by IR spectroscopy, 13C cross polarisation (CP) magic angle spinning (MAS) solid state NMR spectroscopy, differential scanning calorimetry (DSC) and size exclusion chromatography (SEC).

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalJournal of Catalysis
Volume283
Issue number2
DOIs
Publication statusPublished - 27 Oct 2011

Keywords

  • C-CP/MAS-NMR
  • Co-catalysts
  • DSC
  • Lewis acids/bases
  • MALDI-TOF-MS
  • Nickel complexes
  • Polyethylene
  • Polyketone
  • SEC

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