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Bis(arylimino)pyridine iron(III) complexes as catalyst precursors for the oligomerization and polymerization of ethylene

Paper ID Volume ID Publish Year Pages File Format Full-Text
41400 45888 2011 11 PDF Available
Title
Bis(arylimino)pyridine iron(III) complexes as catalyst precursors for the oligomerization and polymerization of ethylene
Abstract

A series of 26 bis(arylimino)pyridine iron(III) complexes containing either electron withdrawing or electron donating substituents in their ligand frameworks was synthesized and characterized. After activation with methylaluminoxane (MAO), these catalysts oligomerize or polymerize ethylene to give both linear and branched products. In contrast to iron(II) complexes, the presence of at least one ortho-substituent at the iminophenyl rings is not obligative for catalytic activities of the iron(III) complexes. A couple of such iron(III) complexes containing meta- and para-substituted bis(arylimino)pyridine compounds were accessible and their oligomerization behaviour revealed interesting differences to the well known iron(II) analogues since both internal and branched olefins were found in the product mixtures beside the expected linear α-olefins. The widths of the resulting molecular weight distributions and the degrees of isomerization of the resulting oligomers strongly depend on the substitution pattern at the ligand frameworks.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (114 K)Download as PowerPoint slideHighlights► Synthesis of new bis(arylimino)pyridine iron(III) catalyst precursors. ► The higher oxidation state of the metal center allows interesting modifications of the ligand frameworks. ► Very narrow product distributions were obtained in ethylene oligomerization reactions. ► “Open” ligand structures lead to internal and branched low molecular weight olefins.

Keywords
Bis(arylimino)pyridine iron complexes; Ethylene oligomerization; Isomerization of olefins; Polymerization; Polyethylene
First Page Preview
Bis(arylimino)pyridine iron(III) complexes as catalyst precursors for the oligomerization and polymerization of ethylene
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 403, Issues 1–2, 22 August 2011, Pages 25–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis