1. Chiral Supramolecular Nanotubes of Single‐Chain Magnets.
- Author
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Houard, Felix, Evrard, Quentin, Calvez, Guillaume, Suffren, Yan, Daiguebonne, Carole, Guillou, Olivier, Gendron, Frédéric, Le Guennic, Boris, Guizouarn, Thierry, Dorcet, Vincent, Mannini, Matteo, and Bernot, Kevin
- Subjects
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MAGNETIC anisotropy , *MAGNETS , *MAGNETIC fields , *NANOTUBES , *MAGNETIC relaxation , *REMANENCE , *CHOLESTERIC liquid crystals - Abstract
We report a single‐chain magnet (SCM) made of a terbium(III) building block and a nitronyl‐nitroxide radical (NIT) functionalized with an aliphatic chain. This substitution is targeted to induce a long‐range distortion of the polymeric chain and accordingly it gives rise to chains that are curled with almost 20 nm helical pitch. They self‐organize as a chiral tubular superstructure made of 11 chains wound around each other. The supramolecular tubes have a 4.5 nm internal diameter. Overall, this forms a porous chiral network with almost 44 % porosity. Ab initio calculations highlight that each TbIII ion possesses high magnetic anisotropy. Indeed, notwithstanding the supramolecular arrangement each chain behaves as a SCM. Magnetic relaxation with both finite and infinite‐size regimes is observed and confirms the validity of the Ising approximation. This is associated with quite strong coercive field and magnetic remanence (Hc=2400 Oe MR=2.09 μB at 0.5 K) for this class of compounds. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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