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A supramolecular chain of dimeric Dy single molecule magnets decorated with azobenzene ligands

Abstract : We report on the synthesis, ab-initio calculations, magnetic and optical characterization of a Dy III-based dimeric compound named DyAZO. The dimers self-organize into a supramolecular chain decorated with photo-isomerizable azobenzene ligands. DyAZO displays a Single-Molecule Magnet (SMM) behavior. However, ab-initio calculations highlight a quite strong admixture of MJ states of the 6 H15/2 level of the Dy III ions, the presence of low-lying excited MJ states as well as an antiferromagnetic Dy-Dy dipolar coupling. This favors zero-field fast tunneling. Accordingly the Dy-doped analogue YDyAZO (5.5% Dy doping) displays an enhanced magnetic relaxation with an hysteresis that is observed at 0.5K. The influence on the magnetic properties of the decorating azobenzene ligand cis-to trans-isomerization has been tested both on solid samples and solutions of DyAZO and YDyAZO. This provides hints for the synthesis of future Dy-based photo-isomerizable molecules.
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Gang Huang, Xiaohui Yi, Frederic Gendron, Boris Le Guennic, Thierry Guizouarn, et al.. A supramolecular chain of dimeric Dy single molecule magnets decorated with azobenzene ligands. Dalton Transactions, Royal Society of Chemistry, 2019, 48 (42), pp.16053-16061. ⟨10.1039/c9dt03540k⟩. ⟨hal-02364866⟩

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