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Issue 18, 2018
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Butterfly-shaped tetranuclear Ln4 clusters showing magnetic refrigeration and single molecule-magnet behavior

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Abstract

Three new Ln4 clusters based on a bidentate Schiff base ligand having formulae [Ln43-OH)2L6(acac)4xCH3CN (Ln(III) = Eu(1), Gd(2) and Dy(3), x = 1 for 1, x = 2 for 2, and x = 0 for 3, HL = 5-(4-o-hydroxybenzylidene)-8-hydroxylquinoline and acac = acetylacetone) have been successfully synthesized and completely characterized. The structures of 1–3 are similar to each other except for the nature of the central ion and the number of free acetonitrile molecules. The four LnIII ions are coplanar and clusters 1–3 have a butterfly-shaped arrangement. Magnetic studies show that cluster 2 displays a weak antiferromagnetic exchange interaction between nearby GdIII centers and exhibits magnetic refrigeration with maximum −ΔSm = 18.85 J kg−1 K−1H = 7.0 T at 2.5 K). Alternating current (ac) magnetic susceptibility measurement of 3 indicates that 3 demonstrates SMMs behavior under a zero direct-current (dc) field, with an effective energy barrier (ΔE/kB) of 79.15 K and a pre-exponential factor τ0 = 5.82 × 10−8 s.

Graphical abstract: Butterfly-shaped tetranuclear Ln4 clusters showing magnetic refrigeration and single molecule-magnet behavior

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Publication details

The article was received on 19 May 2018, accepted on 30 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02479K
Citation: New J. Chem., 2018,42, 14949-14955
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    Butterfly-shaped tetranuclear Ln4 clusters showing magnetic refrigeration and single molecule-magnet behavior

    W. Wang, T. Han, Y. Shao, X. Qiao, Z. Wu, Q. Wang, P. F. Shi, H. Gao and J. Cui, New J. Chem., 2018, 42, 14949
    DOI: 10.1039/C8NJ02479K

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