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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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Supplementary files

Article information


Submitted
25 May 2012
Accepted
27 Jun 2012
First published
09 Jul 2012

Dalton Trans., 2012,41, 10317-10327
Article type
Paper

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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