The Atypical Hysteresis of [Fe(C6F5Tp)2]: Overlay of Spin‐Crossovers and Symmetry‐Breaking Phase Transition
- 26 January 2021
- journal article
- research article
- Published by Wiley in Angewandte Chemie
- Vol. 60 (16), 8803-8807
- https://doi.org/10.1002/anie.202015994
Abstract
The [Fe II (C 6 F 5 Tp) 2 ] spin‐crossover complex is an atypical molecular switch, which can be converted upon annealing between two archetypal spin‐crossover behaviors: 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 to a radical change in the crystal packing. More importantly, the “rounded and broad” hysteretic transition is shown to occurs in a non‐cooperative SCO system and is associated to the occurrence of a symmetry‐breaking phase transition that appears when roughly ca . 50% of SCO are switched.Funding Information
- Centre National de la Recherche Scientifique
- Ministère de l’Enseignement Supérieur, de la Recherche Scientifique et des Technologies de l'Information et de la Communication
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