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Cis-trans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets

Abstract : Geometry and magnetic relaxation modulations in a series of mononuclear dysprosium complexes, [DyLz2(o-vanilin)2]·X·solvent (Lz = 6-pyridin-2-yl-[1,3,5]triazine-2,4-diamine; X = Br- (1), NO3 - (2), CF3SO3 - (3)), were realized by changing the nature of the counter-Anion. The DyIII ions in all complexes are eight-coordinate and in approximate D4d symmetry environments. The magnetic relaxation and anisotropy of these complexes were systematically investigated, both experimentally and from ab initio calculations. All complexes exhibit excellent single-molecule magnetic behavior. Remarkably, magneto-structural studies show that the rotation of the coordinating plane of the square-Antiprismatic environment in complex 2 induces a magnetic relaxation path through higher excited states, yielding a high anisotropy barrier of 615 K (696 K for a diluted sample). Additionally, obvious opening of the hysteresis loop is observed up to 7 K, which is the highest blocking temperature ever reported for dysprosium single-molecule magnets. © The Royal Society of Chemistry 2016.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01341568
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Submitted on : Monday, July 4, 2016 - 2:27:15 PM
Last modification on : Friday, July 10, 2020 - 4:21:21 PM

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J. Wu, Julien Jung, P. Zhang, H. Zhang, J. Tang, et al.. Cis-trans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets. Chem. Sci., 2016, 7 (6), pp.3632--3639. ⟨10.1039/c5sc04510j⟩. ⟨hal-01341568⟩

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