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Large magnetocaloric effect and remarkable single-molecule-magnet behavior in triangle-assembled Ln III6 clusters

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Abstract

Two new and interesting polynuclear lanthanide clusters, namely, [Ln6(acac)4(HL)2(THAM)4(CH3COCH3)2]·2CH3OH (LnIII = Gd (1) and Dy (2), Hacac = acetylacetone, H3L = N′-(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl)picolinohydrazide and THAM = tris(hydroxymethyl)methylaminomethane), were assembled by using a polydentate ligand (H3L) reacting with β-diketonate salts (Ln(acac)3·2H2O, LnIII = Gd and Dy) and the auxiliary ligand THAM, respectively. Single-crystal X-ray structures reveal that 1 and 2 are hexanuclear clusters which are linked by perfect Ln3 triangles via μ3-O and μ2-O atoms. The magnetic investigations reveal that 1 displays cryogenic magnetic refrigeration properties with large magnetic entropy (−ΔSm = 35.4 J kg−1 K−1 with ΔH = 7.0 T and T = 2.0 K). Remarkably, alternating current (ac) magnetic susceptibility measurement reveals that 2 exhibits typical SMM behavior with Ueff/kB = 50.8 K and pre-exponential factor τ0 = 1.5 × 10−6 s. It is one of the rare polynuclear Dy6 SMMs under zero dc field.

Graphical abstract: Large magnetocaloric effect and remarkable single-molecule-magnet behavior in triangle-assembled LnIII6 clusters

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Publication details

The article was received on 29 Jul 2019, accepted on 03 Oct 2019 and first published on 03 Oct 2019


Article type: Paper
DOI: 10.1039/C9NJ03921J
New J. Chem., 2019, Advance Article

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    Large magnetocaloric effect and remarkable single-molecule-magnet behavior in triangle-assembled LnIII6 clusters

    W. Wang, R. Yue, Y. Gao, M. Wang, S. Hao, Y. Shi, X. Kang and Z. Wu, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ03921J

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