Ferrous rather than ferric species are the active sites in bis(imino)pyridine iron ethylene polymerization catalysts

1H NMR and EPR spectroscopic studies show that the iron centers in bis(imino)pyridine iron(II) and bis(imino)pyridine iron(III) olefin polymerization pre-catalysts LFeCl 2 and LFeCl 3 (L=bis(imino)pyridine) are converted upon treatment with methylaluminoxane (MAO) into ferrous complexes of the type...

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Bibliographic Details
Published in:Catalysis communications 2004, Vol.5 (1), p.45-48
Main Authors: Bryliakov, Konstantin P., Semikolenova, Nina V., Zudin, Vladimir N., Zakharov, Vladimir A., Talsi, Evgenii P.
Format: Article
Language:English
Subjects:
1H NMR
EPR
Ethylene
Iron
Mechanism
Polymerization
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Summary:1H NMR and EPR spectroscopic studies show that the iron centers in bis(imino)pyridine iron(II) and bis(imino)pyridine iron(III) olefin polymerization pre-catalysts LFeCl 2 and LFeCl 3 (L=bis(imino)pyridine) are converted upon treatment with methylaluminoxane (MAO) into ferrous complexes of the type [L(Me)Fe(II)(μ-Me) 2AlMe 2] or [LFe(II)(μ-Me) 2AlMe 2] +[Me-MAO] −.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2003.11.010