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A {Gd12Na6} Molecular Quadruple-Wheel with a Record Magnetocaloric Effect at Low Magnetic Fields and Temperatures

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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 145, 期 14, 页码 7743-7747

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AMER CHEMICAL SOC
DOI: 10.1021/jacs.3c016107743

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The reaction of Gd(OAc)3 center dot 4H2O, salicylaldehyde, and CH3ONa in MeCN/MeOH yielded [Gd12Na6(OAc)25(HCO2)5(CO3)6(H2O)12]center dot 9H2O.0.5MeCN, which consists of a quadruple-wheel composed of two {Na3} and two {Gd6} rings. The magnetic properties of this compound exhibit weak antiferromagnetic interactions between GdIII ions, resulting in a record magnetocaloric effect at low temperatures and applied magnetic fields. The magnetic entropy change reaches -Delta Sm= 29.3 J kg-1 K-1 for full demagnetization at T = 0.5 K from B = 1 T.
Reaction of Gd(OAc)3 center dot 4H2O, salicylaldehyde and CH3ONa in MeCN/MeOH affords [Gd12Na6(OAc)25(HCO2)5(CO3)6(H2O)12]center dot 9H2O.0.5MeCN (1 center dot 9H2O.0.5MeCN), whose structure describes a quadruple-wheel consisting of two {Na3} and two {Gd6} rings. The magnetic properties of 1 reveal very weak antiferromagnetic interactions between the GdIII ions, which give rise to a record magnetocaloric effect at low applied magnetic fields and low temperatures. The magnetic entropy change reaches -Delta Sm= 29.3 J kg-1 K-1 for full demagnetization from B = 1 T at T = 0.5 K.

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