A High-Symmetry Double-Shell Gd<sub>30</sub>Co<sub>12</sub> Cluster Exhibiting a Large Magnetocaloric Effect
Hui‐Jie Lun, Lu Xu, Xiang‐Jian Kong, La‐Sheng Long, Lan‐Sun Zheng
Abstract
A high-nuclearity 3d–4f cluster of [Gd30CoII6CoIII6(OH)56(NO3)12(CH3COO)30(H2O)30]·(NO3)22·(en)3·(H2O)3 (1) was synthesized through the reaction of Gd(NO3)3·6H2O, Co(NO3)2·6H2O, and sodium acetate in a mixture of ethanediamine (en), ethanol, and deionized water. The cluster core in 1 features a double-shell structure with a Co12 icosahedron encapsulating a Gd30 icosidodecahedron. A magnetic study reveals that separating Co2+ ions with Gd3+ ions can effectively reduce the magnetic interaction of 3d–4f clusters. Significantly, the magnetocaloric effect (MCE) of 1 at 2 K and 7 T is up to 44.7 J kg–1 K–1, the largest MCE reported to date in the 3d–4f metal clusters.
Topics & Concepts
Magnetic refrigerationChemistryCluster (spacecraft)IonShell (structure)CrystallographySymmetry (geometry)Metal ions in aqueous solutionMagnetizationMagnetic fieldPhysicsGeometryMaterials scienceComputer scienceMathematicsProgramming languageOrganic chemistryQuantum mechanicsComposite materialMagnetism in coordination complexesNanocluster Synthesis and ApplicationsPolyoxometalates: Synthesis and Applications