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A Trinuclear Iron(III) Compound with an Unusual T-Shaped [Fe3(μ 3-O)]7+ Core

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Abstract

Treatment of FeCl3 with 1 equiv of 3-(pyrid-2-yl)-5-(tertbutyl)-1H-pyrazole (L) in basic methanol affords crystalline [Fe3Cl5(μ 3-O)(μ-OMe)2L2(MeOH)] in moderate yield. The compound has an unusual isosceles triangular [Fe3(μ 3-O)(μ-OMe)2]5+ core with one unbridged edge. Two of the iron(III) centres in the compound are approximately octahedral, while the third has a five-coordinate geometry. Magnetic susceptibility measurements show antiferromagnetic coupling between the iron centres, leading to a S = 3/2 magnetic ground state and S = 5/2 excited state that are almost accidentally degenerate according to simulation. An analogous reaction using Fe[ClO4]3 as starting material instead affords the low-spin iron(II) complex [FeL3][ClO4]2.

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Acknowledgements

The authors thank Dr. H. J. Blythe (University of Sheffield) for the magnetic susceptibility data, and Professor Eric McInnes and Drs. Ruth Edge and Joanna Wolowska (University of Manchester) for preliminary EPR measurements on 1. This work was supported by the Leverhulme Trust.

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Authors and Affiliations

  1. School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK

    Leigh F. Jones, Colin A. Kilner & Malcolm A. Halcrow

  2. School of Chemistry, NUI Galway, University Road, Galway, Ireland

    Leigh F. Jones

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  1. Leigh F. Jones
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  2. Colin A. Kilner
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  3. Malcolm A. Halcrow
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Correspondence to Malcolm A. Halcrow.

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Dedicated to Malcolm Chisholm.

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Jones, L.F., Kilner, C.A. & Halcrow, M.A. A Trinuclear Iron(III) Compound with an Unusual T-Shaped [Fe3(μ 3-O)]7+ Core. J Clust Sci 21, 279–290 (2010). https://doi.org/10.1007/s10876-010-0283-0

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