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Intermediate electronic relaxation betweenS=3/2 andS=1/2 states in Fe(J-mph)NO with a jäger-type ligand J-mph

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Abstract

The incomplete spin transition between the low-spin (LS) (S=1/2) and the intermediate-spin (IS) (S=3/2) states in the iron (III) complex Fe(J-mph)NO (mph=4-methyl-o-phenylene), centered atT c≈212 K, has been studied with57Fe Mössbauer spectroscopy and magnetic susceptibility measurements between 80 K and 320 K. The lineshape of the Mössbauer spectra is well reproduced by a two state stochastic relaxation model resulting in values of about 2·106 s−1 to 7·106 s−1 for the IS→LS transition rate constantk IL. The kinetics of this spin transition can be described by an Arrhenius equation yielding activation energiesE IL=1.1 (2) kJ/mol andE LI=6.1 (2) kJ/mol for the IS→LS and LS→IS conversion, respectively.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Erlangen-Nürnberg, Glückstrasse 10, D-8520, Erlangen, F.R. Germany

    J. Dengler & G. Ritter

  2. Institut für Physikalische und Theoretische Chemie der Universität Erlangen-Nürnberg, Egerlandstrasse 3, D-8520, Erlangen, F.R. Germany

    E. König

  3. Department of Chemistry, University of Surrey, GU2 5XH, Guildford, UK

    L. F. Larkworthy & S. K. Sengupta

Authors
  1. J. Dengler
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  2. E. König
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  3. L. F. Larkworthy
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  4. G. Ritter
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  5. S. K. Sengupta
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Dengler, J., König, E., Larkworthy, L.F. et al. Intermediate electronic relaxation betweenS=3/2 andS=1/2 states in Fe(J-mph)NO with a jäger-type ligand J-mph. Hyperfine Interact 56, 1443–1447 (1990). https://doi.org/10.1007/BF02405455

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