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Issue 3, 2019
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A series of new octanuclear Ln8 clusters: magnetic studies reveal a significant cryogenic magnetocaloric effect and slow magnetic relaxation

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Abstract

The reaction of a new pentadentate Schiff base hydrazide ligand, (E)-methyl N′-(2-hydroxy-3-methoxybenzylidene)hydrazinecarboxylate (HL), with lanthanide nitrate, and sodium acetate in the presence of triethylamine, resulted in a novel family of octanuclear neutral compounds, [Ln83-O)4(L)8(CH3COO)4(CO3)2xH2O, where Ln = Gd (1), Tb (2), Dy (3), or Ho (4). Compounds 1–4 contained two unusual Ln4 boat-shaped units, which were held by four L chelating ligands, two μ3-O2−, and one μ4-CO32−. These structures were interconnected by four CH3COO ions, forming a novel Ln8 cluster. Magnetic studies revealed antiferromagnetic Gd⋯Gd interactions in Gd8, which exhibited a significant magnetocaloric effect and a magnetic entropy change as large as 32.49 J K−1 kg−1 at a field of 7 T at 2 K. In addition, Dy8 exhibited a frequency dependent slow relaxation of magnetization at a zero applied direct current magnetic field.

Graphical abstract: A series of new octanuclear Ln8 clusters: magnetic studies reveal a significant cryogenic magnetocaloric effect and slow magnetic relaxation

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Publication details

The article was received on 21 Aug 2018, accepted on 11 Dec 2018 and first published on 18 Dec 2018


Article type: Paper
DOI: 10.1039/C8NJ04231D
Citation: New J. Chem., 2019,43, 1617-1625
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    A series of new octanuclear Ln8 clusters: magnetic studies reveal a significant cryogenic magnetocaloric effect and slow magnetic relaxation

    L. Li, W. Kuang, Y. Li, L. Zhu, Y. Xu and P. Yang, New J. Chem., 2019, 43, 1617
    DOI: 10.1039/C8NJ04231D

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