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Issue 34, 2012
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Complexes of manganese, iron and cobalt with sterically demanding indenyl ligands

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Abstract

A series of manganese, iron and cobalt complexes bearing sterically demanding 1,3-disubstituted indenyl ligands, 1,3-(Me3C)2C9H5 (IndtBu) (1) and 1,3-(C6H11)2C9H5 (IndcHexyl) (2), has been prepared. These complexes have been fully characterised by various spectroscopic techniques, elemental analysis, and X-ray diffraction experiments. In addition the electronic and steric properties of these ligands have been evaluated. Although the cone angles and electronic properties are similar to 1,2,4-(Me3C)3C5H2 (Cp′), indenyl iron half-sandwich complexes are only stable at low temperature. This has been demonstrated for 1-FeI using suitable trapping experiments such as CO or NaCp′ addition to yield 1-Fe(CO)2I and 1-FeCp′, respectively. Overall the metal–ligand bonds in these indenyl compounds are weaker than in the corresponding cyclopentadienyl derivatives. In addition, the bis(indenyl)manganese complexes, 1-Mn and 2-Mn, are high-spin, as established by solid state magnetic susceptibility studies in the temperature range 2–300 K.

Graphical abstract: Complexes of manganese, iron and cobalt with sterically demanding indenyl ligands

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Publication details

The article was received on 25 May 2012, accepted on 27 Jun 2012 and first published on 09 Jul 2012


Article type: Paper
DOI: 10.1039/C2DT31136D
Citation: Dalton Trans., 2012,41, 10317-10327
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    Complexes of manganese, iron and cobalt with sterically demanding indenyl ligands

    M. Maekawa, C. G. Daniliuc, M. Freytag, P. G. Jones and M. D. Walter, Dalton Trans., 2012, 41, 10317
    DOI: 10.1039/C2DT31136D

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