XAS study of the nickel( α-diimine) catalyst for olefin polymerization

The in situ Ni K-edge XAS study of the Ni( α-diimine)Cl 2/methylalumoxane catalyst during 1-decene polymerization indicates the formation of a complex with Ni(II) atoms bonded to C and N atoms as well as a Ni⋯Cl interaction at ca. 4.02 Å, which suggests the formation of a pentacoordinated nickel com...

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Bibliographic Details
Published in:Journal of catalysis 2003-02, Vol.214 (1), p.165-168
Main Authors: Fernando de Souza, Roberto, Simon, Leonardo Coelho, Alves, Maria do Carmo M.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
EXAFS
Nickel
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:The in situ Ni K-edge XAS study of the Ni( α-diimine)Cl 2/methylalumoxane catalyst during 1-decene polymerization indicates the formation of a complex with Ni(II) atoms bonded to C and N atoms as well as a Ni⋯Cl interaction at ca. 4.02 Å, which suggests the formation of a pentacoordinated nickel complex as the active site. This geometry explains spectroscopic and magnetic properties of the complexes and can play an important role in the polymerization of ethylene by late transition metal catalysts.
ISSN:0021-9517
1090-2694
DOI:10.1016/S0021-9517(02)00137-9