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    Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

    Access Status
    Fulltext not available
    Authors
    Szilagyi, Petra
    Dorbes, S.
    Molnár, G.
    Real, J.
    Homonnay, Z.
    Faulmann, C.
    Bousseksou, A.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Szilagyi, P. and Dorbes, S. and Molnár, G. and Real, J. and Homonnay, Z. and Faulmann, C. and Bousseksou, A. 2008. Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex. Journal of Physics and Chemistry of Solids. 69 (11): pp. 2681-2686.
    Source Title
    Journal of Physics and Chemistry of Solids
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0022369708003363#
    ISSN
    0022-3697
    URI
    http://hdl.handle.net/20.500.11937/12334
    Collection
    • Curtin Research Publications
    Abstract

    Thermal and pressure effects have been investigated on the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex by means of Mössbauer spectroscopic, calorimetric, X-ray diffraction and magnetic susceptibility measurements. The complex displays a complete thermal spin transition between the and spin states of FeIII near 245 K with a hysteresis loop of ca. 30 K. This transition is characterised by a change of the enthalpy, ?HHL=7 kJ/mol, entropy, ?SHL=29 J/Kmol, and the unit cell volume, ?VHL=15.4 Å3. Under hydrostatic pressures up to 5.7 kbar the thermal transition shifts to higher temperatures by ca. 16 K/kbar. Interestingly, at a low applied pressure of 500 bar the hysteresis loop becomes wider (ca. 61 K) and the transition is blocked at ~50% upon cooling, indicating a possible (irreversible) structural phase transition under pressure.

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