High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex

Sébastien Bonhommeau 1, 2 Nicolas Bréfuel 1 Villö K. Pálfi 1, 3 Gábor Molnár 1 Antoine Zwick 2 Lionel Salmon 4 Jean-Pierre Tuchagues 1 José Sanchez Costa 5 Jean-François Létard 5 Hauke Paulsen 6 Azzedine Bousseksou 1
1 LCC - Laboratoire de chimie de coordination
2 Laboratoire Physique des Solides de Toulouse
3 Institute of Chemistry [Budapest]
4 LCF - URA 331 - Laboratoire Claude Fréjacques
5 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
6 Institute of Physics
Abstract : A quasi-quantitative photo-induced low-spin (LS) -> high-spin (HS) conversion of FeII ions has been observed in the [Fe(TRIM)2]Cl2 complex by irradiating the sample with blue light (488 nm) at 10 K. The time dependence of the HS -> LS relaxation has been studied between 10 K and 44 K by means of magnetic susceptibility measurements. These relaxation curves could be satisfactorily fitted by mono-exponential decays including tunnelling effect except for temperatures below 30 K. The introduction of a distribution of vibrational frequencies into this model improved significantly the fits in the low-temperature range and gave a good agreement with the experimental data in the whole temperature range suggesting a multi-rate relaxation process in this complex.
Keywords : [Fe(TRIM)2]Cl2 Relaxations High spin Low spin Complex compounds
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Journal articles
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Contributor : Stéphane Toulin <>
Submitted on : Friday, September 22, 2006 - 4:12:38 PM
Last modification on : Friday, January 10, 2020 - 9:10:04 PM

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Sébastien Bonhommeau, Nicolas Bréfuel, Villö K. Pálfi, Gábor Molnár, Antoine Zwick, et al.. High-spin to low-spin relaxation kinetics in the [Fe(TRIM)2]Cl2 complex. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2005, vol. 7, n° 15, p. 2909-2914. ⟨10.1039/b504614a⟩. ⟨hal-00097921⟩

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