期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 28, 页码 8222-8225出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201501659
关键词
magnet recycling; metal separation; neodymium; N; O ligands; rare earths
资金
- U.S. Department of Energy, Office of Science, Early Career Research Program [DE-SC0006518]
- Research Corporation for Science Advancement (Cottrell Scholar Award)
- University of Pennsylvania
- U.S. Department of Energy (DOE) [DE-SC0006518] Funding Source: U.S. Department of Energy (DOE)
Rare-earth metals are critical components of electronic materials and permanent magnets. Recycling of consumer materials is a promising new source of rare earths. To incentivize recycling there is a clear need for simple methods for targeted separations of mixtures of rare-earth metal salts. Metal complexes of a tripodal nitroxide ligand [{(2-(BuNO)-Bu-t)C6H4CH2}(3)N](3-) (TriNOx(3-)), feature a size-sensitive aperture formed of its three (2)-(N,O) ligand arms. Exposure of metal cations in the aperture induces a self-associative equilibrium comprising [M(TriNOx)thf]/ [M(TriNOx)](2) (M=rare-earth metal). Differences in the equilibrium constants (K-eq) for early and late metals enables simple Nd/Dy separations through leaching with a separation ratio S-Nd/Dy=359.
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