Heterometallic Fe2II–UV and Ni2II–UV Exchange‐Coupled Single‐Molecule Magnets: Effect of the 3 d Ion on the Magnetic Properties |
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| Authors: | Lucile Chatelain Dr. Jacques Pécaut Dr. Floriana Tuna Dr. Marinella Mazzanti |
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| Affiliation: | 1. Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne (Switzerland);2. Université Grenoble Alpes, INAC‐SCIB, 38000 Grenoble (France);3. CEA, INAC‐SCIB, 38000 Grenoble (France);4. School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK) |
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| Abstract: | Uranium‐based compounds have been put forward as ideal candidates for the design of single‐molecule magnets (SMMs) with improved properties, but to date, only two examples of exchange‐coupled 3d–5f SMM containing uranium have been reported and both are based on the MnII ion. Here we have synthesized the first examples of exchange‐coupled uranium SMMs based on FeII and NiII. The SMM behavior of these complexes containing a quasi linear {M?O?U?O?M} core arises from intramolecular Fe?U and Ni?U exchange interactions combined with the high Ising anisotropy of the uranyl(V) moiety. The measured values of the relaxation barrier (53.9±0.9 K in the UFe2 complex and of 27.4±0.5 K in the UNi2 complex) show clearly the dependency on the spin value of the transition metal, providing important new information for the future design of improved uranium‐based SMMs. |
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| Keywords: | actinides cations magnetic properties polymetallic complexes single‐molecule magnets uranium |
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