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

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Abstract

We report the synthesis, ab initio calculations, magnetic and optical characterization of a DyIII-based dimeric compound named DyAZO. The dimers self-organize into a supramolecular chain decorated with photo-isomerizable azobenzene ligands. DyAZO displays single-molecule magnet (SMM) behavior. However, ab initio calculations highlight a quite strong admixture of MJ states of the 6H15/2 level of DyIII ions, the presence of low-lying excited MJ states and antiferromagnetic Dy–Dy dipolar coupling. This favors zero-field fast tunneling. Accordingly the Dy-doped analogue YDyAZO (5.5% Dy doping) displays enhanced magnetic relaxation with a hysteresis that is observed at 0.5 K. The influence of the cis- to trans-isomerization of the decorating azobenzene ligand on magnetic properties has been tested for both solid samples and solutions of DyAZO and YDyAZO. This provides hints for the synthesis of future Dy-based photo-isomerizable molecules.

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

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Publication details

The article was received on 02 Sep 2019, accepted on 07 Oct 2019 and first published on 07 Oct 2019


Article type: Paper
DOI: 10.1039/C9DT03540K
Dalton Trans., 2019, Advance Article

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

    G. Huang, X. Yi, F. Gendron, B. Le Guennic, T. Guizouarn, C. Daiguebonne, G. Calvez, Y. Suffren, O. Guillou and K. Bernot, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT03540K

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