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

Sébastien Bonhommeau, Nicolas Bréfuel, Villö K. Pálfi, Gábor Molnár, Antoine Zwick, Lionel Salmon, Jean Pierre Tuchagues, José Sanchez Costa, Jean François Létard, Hauke Paulsen, Azzedine Bousseksou*

*Corresponding author for this work
29 Citations (Scopus)


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.

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Issue number15
Pages (from-to)2909-2914
Number of pages6
Publication statusPublished - 07.08.2005


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