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

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.
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Submitted on : Friday, September 22, 2006 - 4:12:38 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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