Cryogenic magnetic refrigerants based on the magnetocaloric effect (MCE) hold significant potential as substitutes for the expensive and scarce He-3. Gd(III)-based complexes are considered excellent candidates for low-temperature magnetic refrigerants. We have synthesized a series of Ln(III)-based metal-organic framework (MOF) (Ln = Gd/Dy) by the slow release of oxalates in situ from organic ligands (disodium edetate dehydrate (EDTA-2Na) and thiodiglycolic acid). Structural analysis shows that the is a neutral 3D framework with one-dimensional channels connected by [Ln(HO)] as nodes and CO as linkers. Magnetic measurements show that exhibits very weak antiferromagnetic interactions with a maximum -Δ value of 36.6 J kg K (-Δ = 74.47 mJ cm K) at 2 K and 7 T. The -Δ value is 28.4 J kg K at 2 K and 3 T, which is much larger than that of commercial GdGaO (GGG), indicating its potential as a low-temperature magnetic refrigerant.
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