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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Authors: | J. Dengler E. König L. F. Larkworthy G. Ritter S. K. Sengupta |
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Affiliation: | 1. Physikalisches Institut der Universit?t Erlangen-Nürnberg, Glückstrasse 10, D-8520, Erlangen, F.R. Germany 2. Institut für Physikalische und Theoretische Chemie der Universit?t Erlangen-Nürnberg, Egerlandstrasse 3, D-8520, Erlangen, F.R. Germany 3. Department of Chemistry, University of Surrey, GU2 5XH, Guildford, UK
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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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