Magnetic Slow Relaxation in a Metal–Organic Framework Made of Chains of Ferromagnetically Coupled Single-Molecule Magnets
L'Institut des Sciences Chimiques de Rennes est en couverture du réputé Chemistry A European Journal pour les travaux de Gang Huang, Guglielmo Fernandez-Garcia, Insa Badiane, Magatte Camarra, Stéphane Freslon, Olivier Guillou, Carole Daiguebonne, Federico Totti, Olivier Cador, Thierry Guizouarn, Boris Le Guennic, et Kevin Bernot : Magnetic Slow Relaxation in a Metal–Organic Framework Made of Chains of Ferromagnetically Coupled Single-Molecule Magnets
Abstract: We report the study of a Dy-based metal–organic framework (MOF) with unprecedented magnetic properties.
The compound is made of nine-coordinated DyIII magnetic building blocks (MBBs) with poor intrinsic single-molecule magnet behavior. However, the MOF architecture constrains the MBBs in a one-dimensional structure that induces a ferromagnetic coupling between them. Overall, the material shows a magnetic slow relaxation in absence of external static field and a hysteretic behavior at 0.5 K. Low-temperature magnetic studies, diamagnetic doping, and ab initio calculations highlight the crucial role played by the Dy–Dy ferromagnetic interaction. Overall, we report an original magnetic object at the frontier between single-chain magnet and single-molecule magnets that host intrachain couplings that cancel quantum tunneling between the MBBs. This compound is evidence that a bottom-up approach through MOF design can induce spontaneous organization of MBBs able to produce remarkable molecular magnetic materials.