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Chiral Iron(II) and Cobalt(II) Complexes with Biphenyl-Bridged Bis(pyridylimine) Ligands – Syntheses, Structures and Reactivities

✍ Scribed by Christoph Vedder; Frank Schaper; Hans-Herbert Brintzinger; Mika Kettunen; Sebastian Babik; Gerhard Fink

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
189 KB
Volume
2005
Category
Article
ISSN
1434-1948

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✦ Synopsis

Abstract

A new class of iron(II) and cobalt(II) complexes with neutral, tetradentate bis(pyridylimine) chelate ligands bridged by a chiral 6,6′‐dimethylbiphenyl backbone has been synthesized. Their dihalogen derivatives gave spectral, magnetic and X‐ray diffraction results in agreement with a C~2~‐symmetric, approximately octahedral geometry with cis‐positioned halide ligands and high‐spin d‐electron configuration. ^1^H NMR signals of these paramagnetic complexes were assigned by correlating line widths with reciprocal proton‐metal distances. Methyl substitution in 6‐position of the pyridyl rings lead to a different, presumably square‐pyramidal coordination geometry under dissociation of one chloride ion. Fe^II^ dimethyl and diisocyanide derivatives were shown to have low‐spin configuration and C~1~‐symmetric geometry. With respect to MAO‐activated olefin polymerization, significant catalytic activities were reproducibly obtained only under conditions, where the original complex structure was degraded. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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