期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 49, 页码 13434-13438出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407334
关键词
exchange interactions; magnetism; polymetallic complexes; single-molecule magnets; uranium
资金
- Agence Nationale de la Recherche [ANR-10-BLAN-0729]
- EPSRC UK National EPR Facility
- Engineering and Physical Sciences Research Council [974248] Funding Source: researchfish
Mixed-metal uranium compounds are very attractive candidates in the design of single-molecule magnets (SMMs), but only one 3d-5f hetero-polymetallic SMM containing a uranium center is known. Herein, we report two trimeric heterodimetallic 3d-5f complexes self-assembled by cation-cation interactions between a uranyl(V) complex and a TPA-capped M-II complex (M=Mn (1), Cd (2); TPA = tris(2-pyridylmethyl) amine). The metal centers were strategically chosen to promote the formation of discrete molecules rather than extended chains. Compound 1, which contains an almost linear {Mn-O=U=O-Mn} core, exhibits SMM behavior with a relaxation barrier of 81 +/- 0.5 K-the highest reported for a mono-uranium system-arising from intra-molecular Mn-U exchange interactions combined with the high Ising anisotropy of the uranyl(V) moiety. Compound 1 also exhibits an open magnetic hysteresis loop at temperatures less than 3 K, with a significant coercive field of 1.9 T at 1.8 K.
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