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Butterfly shaped tetranuclear Ln4 clusters showing magnetic refrigeration and single molecule magnet behavior

Abstract

Three new Ln4 clusters based a bidentate Schiff base ligand having formulae, [Ln4(μ3-OH)2L6(acac)4]·xCH3CN (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. Structures of 1−3 are similar to each other except the nature of central ion and number of free acetonitrile molecules. The four LnIII ions are coplaner, and clusters 1-3 are butterfly shaped arrangement. Magnetic studies show that cluster 2 displays weak antiferromagnetic exchange interaction between nearby GdIII centers and exhibits magnetic refrigeration with maximum −ΔSm = 18.85 J kg−1 K−1 (ΔH = 7.0 T at 2.5 K). Alternating current (ac) magnetic susceptibility measurement of 3 demonstrates SMMs behavior under a zero direct-current (dc) field, with effective energy barrier (ΔE/kB) of 79.15 K and pre-exponential factor τ0 = 5.82 × 10−8 s.

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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, Accepted Manuscript
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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. Shi, H. Gao and J. Cui, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02479K

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