Pressure-Induced Conversion of a Paramagnetic FeCo Complex into a Molecular Magnetic Switch with Tuneable Hysteresis |
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| Authors: | Yanling Li Amina Benchohra Buqin Xu Benoît Baptiste Keevin Béneut Paraskevas Parisiades Ludovic Delbes Alain Soyer Kamel Boukheddaden Rodrigue Lescouëzec |
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| Institution: | 1. Sorbonne Université, Institut Parisien de Chimie Moléculaire, CNRS UMR 8232, 4 place Jussieu, 75252 Paris cedex 5, France;2. Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR 7590 CNRS, UMR 206 IRD, Museum National d'Histoire Naturelle MNHN, 4 place Jussieu, 75005 Paris, France;3. Université Paris-Saclay, UVSQ, Groupe d'Etudes de la Matière Condensée, CNRS UMR No 8635, 45 Avenue des Etats-Unis, 78035 Versailles cedex, France |
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| Abstract: | A key challenge in the design of magnetic molecular switches is to obtain bistability at room temperature. Here, we show that application of moderate pressure makes it possible to convert a paramagnetic FeIII2CoII2 square complex into a molecular switch exhibiting a full dia- to paramagnetic transition: FeIICoIII ⇔ FeIIICoII. Moreover, the complex follows a rare behavior: the higher the pressure, the broader the magnetic hysteresis. Thus, the application of an adequate pressure allows inducing a magnetic bistability at room temperature with predictable hysteresis width. The structural studies at different pressures suggest that the pressure-enhanced bistability is due to the strengthening of intermolecular interactions upon pressure increase. An original microscopic Ising-like model including pressure effects is developed to simulate this unprecedented behavior. Overall, this study shows that FeCo complexes could be very sensitive piezo switches with potential use as sensors. |
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| Keywords: | charge transfer coordination chemistry cyanides magnetism molecular switches |
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