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Hyperfine coupling and slow magnetic relaxation in isotopically enriched Dy III mononuclear single-molecule magnets

Abstract : The four main stable isotopes of the [ADy(tta)3(L)]·C6H14 (ADy with A = 161–164) Single-Molecule Magnet (SMM) (tta− = 2-thenoyltrifluoroacetylacetonate and L = 2-{[2-methylpyridiyl]-4,5-[4,5-bis(propylthio)-tetrathiafulvalenyl]-1H-benzimidazol-2-yl}pyridine) have been magnetically investigated and structurally characterized by single crystal X-ray diffraction. The two nuclear spin-free 162/164Dy behave the same from a dynamic magnetic point of view and with slower magnetic relaxation than the two pure magnetically active isotopically substituted 161/163Dy. In addition, this paper demonstrates that 161Dy and 163Dy relax differently even if they both carry I = 5/2 nuclear spin. After the release of the dipolar interactions through magnetic dilution, ([161Dy0.05Y0.95(tta)3(L)]·C6H14) (161Dy@Y) relaxes four times slower than 163Dy@Y due to different hyperfine coupling constants.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02122161
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Submitted on : Wednesday, April 1, 2020 - 5:07:16 PM
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J. Flores Gonzalez, F. Pointillart, O. Cador. Hyperfine coupling and slow magnetic relaxation in isotopically enriched Dy III mononuclear single-molecule magnets. Inorganic Chemistry Frontiers, Royal Society of Chemistry, 2019, 6 (4), pp.1081-1086. ⟨10.1039/c8qi01209a⟩. ⟨hal-02122161⟩

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