Unlocking the potential of molecule-based magnets at room temperature and above Itziar Oyarzabal 1,2 , Panagiota Perlepe 3,4 , Andrei Rogalev 5 , Corine Mathoniére 3 , Rodolphe Clérac 3 1. BCMaterials, UPV/EHU Science Park, 48940 Leioa, Spain. 2. IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain. 3. Univ. Bordeaux, CNRS, CRPP, UMR 5031, 33600 Pessac, France. 4. Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, 33600 Pessac, France. 5. ESRF – The European Synchrotron, 38043 Grenoble, France. Molecule-based magnets are at the forefront of fundamental research, as these magnetic materials offer a means to synthetically tune their physical properties that are not accessible to traditional inorganic-based magnets. A new ground has been laid in this field through the coordination of redox-active Cr(II) with pyrazine (pyz) bridging ligands affording Cr(pyz)2Cl2, a 2D coordination network with remarkable physical properties displaying a ferrimagnetic ordered state below 55 K and conductivity up to 32 mS cm-1 at room temperature (RT). 1 These extraordinary properties stem from an intrinsic one-electron reduction from the Cr(II) ion to one of the neutral pyrazine ligands, which subsequently transforms the 2D network into a highly delocalized system. The post- synthetic reduction of the 2D Cr(pyz)2Cl2 network generates a material that retains magnetic hysteresis up to 515 K and displays a RT coercivity value of 7500 Oe, unprecedented values for molecule-based magnets. 2 References 1. K. S. Pedersen et al., Nat. Chem.2018, 10, 1056-1061. 2. P. Perlepe et al., Science2020, 370, 587–592.
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