Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 37, Pages 12983-12990Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja104848m
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Funding
- EPSRC
- Leverhulme Trust
- Heriot-Watt University
- Spanish Ministry for Science and Innovation [MAT2009-13977-C03, CSD2007-0010]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- EPSRC [EP/H011188/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H011188/1] Funding Source: researchfish
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The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [Mn(4)(III)Le(4)(III)(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 Ln(III) ions housed within a square of Mn-III 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 Gd-III ions with the anisotropic Tb-III and Dy-III 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.
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