Tuning the Ferrotoroidic Coupling and Magnetic Hysteresis in Double-Triangle Complexes {Dy3MIIIDy3} via the MIII-linker

Ashtree, JM, Borilović, I, Vignesh, KR, Swain, A, Hamilton, SH, Whyatt, YL, Benjamin, SL, Phonsri, W, Forsyth, CM, Wernsdorfer, W, Soncini, A ORCID: https://orcid.org/0000-0002-6779-7304, Rajaraman, G ORCID: https://orcid.org/0000-0001-6133-3026, Langley, SK ORCID: https://orcid.org/0000-0002-2241-1551 and Murray, KS ORCID: https://orcid.org/0000-0003-4098-9389 (2021) Tuning the Ferrotoroidic Coupling and Magnetic Hysteresis in Double-Triangle Complexes {Dy3MIIIDy3} via the MIII-linker. European Journal of Inorganic Chemistry, 2021 (5). pp. 435-444. ISSN 1434-1948

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Abstract

We present the syntheses, structures, magnetic data and theoretical analyses for two families of heptanuclear clusters, wherein two staggered dysprosium(III) triangles are linked by various M(III) d-/p-block ions. The families differ in the counter-anion and are of formulae [DyIII6MIII(OH)8(o-tol)12(MeOH)5(NO3)] ⋅ 4MeOH and [DyIII6MIII(OH)8(o-tol)12(MeOH)6]Cl ⋅ 6MeOH (M=Cr, Mn, Fe, Co, Al; o-tol=o-toluate). We find that variation of the central metal ion M is crucial in tuning the toroidal moments on the triangular units, with diamagnetic M linking ions enhancing the ferrotoroidic coupling. By detailed simulation and analysis of various magnetic measurements, including sub-kelvin microSquid hysteresis loops, we identified the specific signature of the M linking ions’ modulation of toroidal properties, including the mechanism whereby anisotropic, paramagnetic M ions lead to hysteresis profiles with larger remnant magnetisations and broader coercive fields.