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Modulating single-molecule magnet behavior towards multiple magnetic relaxation processes through structural variation in Dy4 clusters

Abstract

Three Dy4 clusters, [Dy4(tmhd)8(L)2(CH3OH)2]·CH3OH (1), [Dy4(hfac)8(L)2(DMF)2]·C7H16 (2) and Dy4(dbm)6(L)2(μ3-OH)2]·CH2Cl2 (3) (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedione, hfac = hexafluoroacetylacetonate, dbm = 1,3-diphenyl-1,3-propanedione, HL = 2-[(2-(hydroxyimino)propanehydrazide)methyl), have been successfully synthesized by using three different β-diketonate salts (Dy(tmhd)3·2H2O, Dy(hfac)3·2H2O, and Dy(dbm)3·2H2O) to react with HL and changing the solvent. The X-ray structural analysis exhibit that four DyIII ions in clusters 1 and 2 are linearly arranged, however, cluster 3 contains one Dy4 center with rhombus-shaped arrangement. The different structures of three Dy4 clusters were profoundly affected by these minor changes in β-diketonate or a change in solvent. Magnetic studies reveal that Dy4 clusters 1-3 exhibit different single-molecule magnets (SMMs) behaviors under a zero dc field. 1 and 2 display slow magnetic relaxation behaviors with effective energy barriers ΔE/kB = 1.44 K for 1 and ΔE/kB =50.96 K for 2; while for 3, two distinct slow magnetic relaxation processes are observed, with effective energy barriers ΔE/kB = 40.45 K for fast relaxation and ΔE/kB = 113.63 K for slow relaxation processes. This study shows that the β-diketonate coligands play an important role in modulating molecule structures and further affecting the magnetic dynamics of the lanthanide clusters towards multiple magnetic relaxation processes.

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Publication details

The article was received on 11 Mar 2018, accepted on 02 May 2018 and first published on 03 May 2018


Article type: Research Article
DOI: 10.1039/C8QI00214B
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Modulating single-molecule magnet behavior towards multiple magnetic relaxation processes through structural variation in Dy4 clusters

    W. Wang, X. Kang, H. Shen, Z. Wu, H. Gao and J. Cui, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00214B

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