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Issue 6, 2016
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Cistrans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets

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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.

Graphical abstract: Cis–trans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets

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Publication details

The article was received on 24 Nov 2015, accepted on 10 Feb 2016 and first published on 16 Feb 2016


Article type: Edge Article
DOI: 10.1039/C5SC04510J
Citation: Chem. Sci., 2016,7, 3632-3639
  • Open access: Creative Commons BY license
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    Cistrans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets

    J. Wu, J. Jung, P. Zhang, H. Zhang, J. Tang and B. Le Guennic, Chem. Sci., 2016, 7, 3632
    DOI: 10.1039/C5SC04510J

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