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Pressure‐Induced Conversion of a Paramagnetic FeCo Complex into a Molecular Magnetic Switch with Tuneable Hysteresis
Author(s) -
Li Yanling,
Benchohra Amina,
Xu Buqin,
Baptiste Benoît,
Béneut Keevin,
Parisiades Paraskevas,
Delbes Ludovic,
Soyer Alain,
Boukheddaden Kamel,
Lescouëzec Rodrigue
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202008051
Subject(s) - paramagnetism , bistability , hysteresis , intermolecular force , condensed matter physics , magnetic hysteresis , ising model , materials science , chemical physics , molecular switch , chemistry , nanotechnology , nuclear magnetic resonance , magnetic field , molecule , magnetization , optoelectronics , physics , organic chemistry , quantum mechanics
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 Fe III 2 Co II 2 square complex into a molecular switch exhibiting a full dia‐ to paramagnetic transition: Fe II Co III ⇔ Fe III Co II . 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.