期刊
NATURE CHEMISTRY
卷 4, 期 12, 页码 1011-1017出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1494
关键词
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资金
- Commissariat a l'Energie Atomique, Direction de l'Energie Nucleaire, RBPCH programme
- Agence Nationale de la Recherche [ANR-10-BLAN-0729]
- Agence Nationale de la Recherche (ANR) [ANR-10-BLAN-0729] Funding Source: Agence Nationale de la Recherche (ANR)
Discrete molecular compounds that exhibit both magnetization hysteresis and slow magnetic relaxation below a characteristic 'blocking' temperature are known as single-molecule magnets. These are promising for applications including memory devices and quantum computing, but require higher spin-inversion barriers and hysteresis temperatures than currently achieved. After twenty years of research confined to the d- block transition metals, scientists are moving to the f-block to generate these properties. We have now prepared, by cation-promoted self-assembly, a large 5f-3d U12Mn6 cluster that adopts a wheel topology and exhibits single-molecule magnet behaviour. This uranium-based molecular wheel shows an open magnetic hysteresis loop at low temperature, with a non-zero coercive field (below 4 K) and quantum tunnelling steps (below 2.5 K), which suggests that uranium might indeed provide a route to magnetic storage devices. This molecule also represents an interesting model for actinide nanoparticles occurring in the environment and in spent fuel separation cycles.
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