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DSC Monitoring of the Spin Crossover in Fe(II) Complexes

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Abstract

Heat flow to [Fe(bzimpy)2](ClO4)2⋅0.25H2O complex (bzimpy=2,6-bis(benzimidazol-2-yl)pyridine) (I) was measured between 300 and 460 K by differential scanning calorimetry. This exhibits a well-developed peak characteristic of the first-order phase transitions at temperature 403 K. The enthalpy and entropy of transition from low-spin to high-spin state has been determined to be ΔH=17 kJ mol−1 and ΔS=43.0 Jmol−1 K−1. Heat flow to [Fe(bzimpy−1H)2]⋅H2O complex (bzimpy −1H=deprotonated bzimpy) (II) was measured between 300 and 580 K. The spin crossover in this system is accompanied with liberation of crystal water on the first heating. To monitor the structural changes during the spin crossover, powder diffraction data have been collected as a function of temperature.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Slovak Technical University, SK–812 37, Bratislava, Slovakia

    B. Papánková, M. Vrbová & R. Boča

  2. Department of Physical Chemistry, Slovak Technical University, SK–812 37, Bratislava, Slovakia

    P. Šimon

  3. Institute of Physical Chemistry, Darmstadt University of Technology, D–64289, Darmstadt, Germany

    K. Falk

  4. Institute of Material Science, Darmstadt University of Technology, D–64289, Darmstadt, Germany

    G. Miehe & H. Fuess

Authors
  1. B. Papánková
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  2. M. Vrbová
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  3. R. Boča
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  4. P. Šimon
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  5. K. Falk
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  6. G. Miehe
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  7. H. Fuess
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Papánková, B., Vrbová, M., Boča, R. et al. DSC Monitoring of the Spin Crossover in Fe(II) Complexes. Journal of Thermal Analysis and Calorimetry 67, 721–731 (2002). https://doi.org/10.1023/A:1014377410046

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  • DOI: https://doi.org/10.1023/A:1014377410046

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