Chiral iron(II) and cobalt(II) complexes with biphenyl-bridged bis(pyridylimine) ligands : syntheses, structures and reactivities

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2005
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Vedder, Christoph
Schaper, Frank
Kettunen, Mika
Babik, Sebastian
Fink, Gerhard
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European Journal of Inorganic Chemistry. 2005, 2005(6), pp. 1071-1080. ISSN 1434-1948. eISSN 1099-0682. Available under: doi: 10.1002/ejic.200400912
Zusammenfassung

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 C2-symmetric, approximately octahedral geometry with cis-positioned halide ligands and high-spin d-electron configuration. 1H 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. FeII dimethyl and diisocyanide derivatives were shown to have low-spin configuration and C1-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.

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540 Chemie
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Iron(II), cobalt(II), bianiline, pyridylimine
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ISO 690VEDDER, Christoph, Frank SCHAPER, Hans-Herbert BRINTZINGER, Mika KETTUNEN, Sebastian BABIK, Gerhard FINK, 2005. Chiral iron(II) and cobalt(II) complexes with biphenyl-bridged bis(pyridylimine) ligands : syntheses, structures and reactivities. In: European Journal of Inorganic Chemistry. 2005, 2005(6), pp. 1071-1080. ISSN 1434-1948. eISSN 1099-0682. Available under: doi: 10.1002/ejic.200400912
BibTex
@article{Vedder2005Chira-23698,
  year={2005},
  doi={10.1002/ejic.200400912},
  title={Chiral iron(II) and cobalt(II) complexes with biphenyl-bridged bis(pyridylimine) ligands : syntheses, structures and reactivities},
  number={6},
  volume={2005},
  issn={1434-1948},
  journal={European Journal of Inorganic Chemistry},
  pages={1071--1080},
  author={Vedder, Christoph and Schaper, Frank and Brintzinger, Hans-Herbert and Kettunen, Mika and Babik, Sebastian and Fink, Gerhard}
}
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