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[MnIII4LnIII4] Calix[4]arene Clusters as Enhanced Magnetic Coolers and Molecular Magnets

AuthorsKarotsis, G.; Teat, Simon J.; Morales, Juan José; Evangelisti, Marco; Dalgarno, Scott J.
Issue Date2010
PublisherAmerican Chemical Society
CitationJournal of the American Chemical Society 132(37): 12983-12990 (2010)
AbstractThe use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [MnIII4LnIII4(OH)4(C4)4(NO3)2(DMF)6(H2O)6](OH)2 (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of LnIII ions housed within a square of MnIII ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic GdIII ions with the anisotropic TbIII and DyIII ions “switches” the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization.
Identifiersdoi: 10.1021/ja104848m
issn: 0002-7863
e-issn: 1520-5126
Appears in Collections:(ICMA) Artículos
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