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

作者：Beckmann Udo^*; Eichberger Eva; Rufinska Anna; Sablong Rafael; Klaeui Wolfgang

来源：Journal of Catalysis, 2011, 283(2): 143-148.

DOI：10.1016/j.jcat.2011.08.002

• Polyketone
• Polyethylene
• Nickel complexes
• Lewis acids/bases
• Co-catalysts
• C-13-CP/MAS-NMR
• DSC
• SEC
• MALDI-TOF-MS

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, C-13 cross polarisation (CP) magic angle spinning (MAS) solid state NMR spectroscopy, differential scanning calorimetry (DSC) and size exclusion chromatography (SEC).

• 出版日期2011-10-27