Abstract
The copolymerization of ethene and carbon monoxide can be catalyzed with square planar arenidotriphenylphosphane nickel(II) complexes containing an N,O-chelate ligand. To examine the influence of the phosphorus ligand on the catalytic activity, five new nickel(II) complexes with P-ligands of different basicities and different steric demands were synthesized and fully characterized including the determination of the crystal structures of three of the complexes. The investigation of the catalytic activity of the new compounds showed a decisive influence of the steric properties of the P-ligand. A minimum steric demand is essential to ensure catalytic activity.
Highlights
Phosphanes are widely used as ligands in catalysts for reactions such as hydroformylations, hydrogenations, and oligomerizations in organometallic and coordination chemistry
A positive inductive effect leads to a high electron density at the phosphorus atom, while a negative inductive effect reduces the electron density at the P-atom which affects the electronic situation at the metal centre. e electronic effects in uence the basicity of the phosphorus atom. e basicity of phosphanes has been widely documented in the literature [6,7,8,9,10,11]
In this work we report on the variation of the P-ligand on the basis of complex K2, including the synthesis and characterization of the nickel complexes with different P-ligands and the studies of the new compounds as catalysts for the copolymerization of ethene and C . xamples for the in uence of different steric and electronic properties of phosphane ligands on the catalytic activity of nickel and palladium complexes are documented in the literature [29,30,31,32,33]
Summary
Bioanorganische Chemie und Katalyse, Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany 2 Lehrstuhl II: Material- und Strukturforschung, Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany. E copolymerization of ethene and carbon monoxide can be catalyzed with square planar arenidotriphenylphosphane nickel(II) complexes containing an N,O-chelate ligand. To examine the in uence of the phosphorus ligand on the catalytic activity, ve new nickel(II) complexes with P-ligands of different basicities and different steric demands were synthesized and fully characterized including the determination of the crystal structures of three of the complexes. E investigation of the catalytic activity of the new compounds showed a decisive in uence of the steric properties of the P-ligand. A minimum steric demand is essential to ensure catalytic activity
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