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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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Supplementary files

Article information


Submitted
24 Nov 2015
Accepted
10 Feb 2016
First published
16 Feb 2016

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2016,7, 3632-3639
Article type
Edge Article

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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