bcmubx2110 – Metal organic magnets with large coercivity and ordering temperatures up to 242 C
BCM-UBx-Poster-Dandan-LOUMolecule-based metal-organic magnets with large coercivity and ordering temperatures up to 242°C
Inorganic materials such as pure metals, metal oxides and intermetallic compounds, have been widely implemented as room-temperature (RT) magnets in a large number of modern-day technological applications including information storage devices, household appliances, medical equipment, etc. Despite their impressive performances in these applications, inorganic magnets suffer several drawbacks, including high energy consuming fabrication (e.g., for SmCo and AlNiCo) limited access to elemental resources (e.g., in the rare earth–based magnets NdFeB and SmCo), and lack of chemical tunability. Coordination chemistry offers a promising approach for the design of next-generation magnets, as the construction of molecule-based materials affords almost unlimited possibilities for the tuning of the physical properties. On the basis of this strategy, the post-synthetic reduction of preassembled coordination networks, composed of chromium metal ions and pyrazine linkers, leads to the appearance of magnetization hysteresis up to 515 K with a coercive field of 7500 Oe at RT for Li0.7[Cr(pyrazine)2]Cl0.7·0.25(THF). This compound consists of a two-dimensional network made of CrII ions and radical pyrazines with layers of Li+ and Cl– ions and THF intercalated in-between the planes. It should be noted that before the discovery of this compound, there was not a single metal-organic compound that exhibited magnetic hysteresis loops with coercive fields of more than a few Oersted at RT.
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