Self‐Assembly of a 3d–5f Trinuclear Single‐Molecule Magnet from a Pentavalent Uranyl Complex |
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| Authors: | Lucile Chatelain James P S Walsh Dr Jacques Pécaut Dr Floriana Tuna Dr Marinella Mazzanti |
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| Affiliation: | 1. Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR‐E3 CEA‐UJF, INAC, CEA‐Grenoble, 17 rue des Martyrs, F‐38054 Grenoble Cedex 09 (France);2. School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK);3. Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH‐1015 Lausanne (Switzerland) |
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| Abstract: | 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 MII 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 intramolecular 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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| Keywords: | exchange interactions magnetism polymetallic complexes single‐molecule magnets uranium |
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