Chiral Supramolecular Nanotubes of Single‐Chain Magnets |
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Authors: | Felix Houard Quentin Evrard Guillaume Calvez Yan Suffren Carole Daiguebonne Olivier Guillou Frdric Gendron Boris Le Guennic Thierry Guizouarn Vincent Dorcet Matteo Mannini Kevin Bernot |
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Institution: | Felix Houard,Quentin Evrard,Guillaume Calvez,Yan Suffren,Carole Daiguebonne,Olivier Guillou,Frédéric Gendron,Boris Le Guennic,Thierry Guizouarn,Vincent Dorcet,Matteo Mannini,Kevin Bernot |
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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. |
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Keywords: | chirality lanthanides nanotubes radicals single-chain magnets supramolecular chemistry |
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