期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 2, 页码 780-784出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913019
关键词
chirality; lanthanides; nanotubes; radicals; single-chain magnets; supramolecular chemistry
资金
- INSA Rennes, CNRS
- MIUR-Italy
- CNRS via EMERGENCE@INC
- CNRS via PICS FLORENNES
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 Tb-III 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 (H-c=2400 Oe M-R=2.09 mu(B) at 0.5 K) for this class of compounds.
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