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Issue 39, 2011
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Accidentally on purpose: construction of a ferromagnetic, oxime-based [MnIII2] dimer

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The serendipitous self-assembly of the complex [MnIII2ZnII2(Ph-sao)2(Ph-saoH)4(hmp)2] (1),whose magnetic core consists solely of two symmetry equivalent Mn(III) ions linked by two symmetry equivalent –N–O– moieties, provides a relatively simple model complex with which to study the magneto-structural relationship in oxime-bridged Mn(III) cluster compounds. Dc magnetic susceptibility measurements reveal ferromagnetic (J = +2.2 cm−1) exchange resulting in an S = 4 ground state. Magnetisation measurements performed at low temperatures and high fields reveal the presence of significant anisotropy, with ac measurements confirming slow relaxation of the magnetisation and Single-Molecule Magnetism behaviour. Simulations of high field, high frequency EPR data reveal a single ion anisotropy, D(MnIII) = −3.83 cm−1. DFT studies on a simplified model complex of 1 reveal a pronounced dependence of the exchange coupling on the relative twisting of the oxime moiety with respect to the metal ion positions, as suggested previously in more complicated [MnIII3] and [MnIII6] clusters.

Graphical abstract: Accidentally on purpose: construction of a ferromagnetic, oxime-based [MnIII2] dimer

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Publication details

The article was received on 14 Jun 2011, accepted on 13 Jul 2011 and first published on 22 Aug 2011

Article type: Paper
DOI: 10.1039/C1DT11118C
Citation: Dalton Trans., 2011,40, 9999-10006
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    Accidentally on purpose: construction of a ferromagnetic, oxime-based [MnIII2] dimer

    R. Inglis, E. Houton, J. Liu, A. Prescimone, J. Cano, S. Piligkos, S. Hill, L. F. Jones and E. K. Brechin, Dalton Trans., 2011, 40, 9999
    DOI: 10.1039/C1DT11118C

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