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Article Dans Une Revue Angewandte Chemie Année : 2021

The Atypical Hysteresis of [Fe(C6F5Tp)2]: Overlay of Spin-Crossovers and Symmetry-Breaking Phase Transition

Benoit Baptiste
  • Fonction : Auteur
Erik Elkaïm
  • Fonction : Auteur
Nathalie Guillou
  • Fonction : Auteur
David Kreher
Amina Benchohra

Résumé

The [FeII(C6F5Tp)2] spin-crossover complex is an atypical molecular switch, which can be converted upon annealing between two archetypal spin-crossover behaviours: from an extremely gradual spin-crossover to a broad hysteretic spin-transition (of ca. 65 K). The hysteresis shows an uncommon ``rounded shape'' that is reproducible upon cycling temperature. In depth structural studies reveal a first crystal phase transition, which occurs upon melting and recrystallizing at high temperature. This first irreversible transition is associated with a radical change in the crystal packing. More importantly, the ``rounded and broad'' hysteretic transition is shown to occur in a non-cooperative SCO system and is associated with the occurrence of a symmetry-breaking phase transition that appears when roughly ca. 50 % of the SCO complexes are switched.

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hal-03955841 , version 1 (25-01-2023)

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Benoit Baptiste, Erik Elkaïm, Nathalie Guillou, David Kreher, Rodrigue Lescouëzec, et al.. The Atypical Hysteresis of [Fe(C6F5Tp)2]: Overlay of Spin-Crossovers and Symmetry-Breaking Phase Transition. Angewandte Chemie, 2021, 133 (16), pp.8885--8889. ⟨10.1002/ange.202015994⟩. ⟨hal-03955841⟩
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