A Uranium‐Based UO2+–Mn2+ Single‐Chain Magnet Assembled trough Cation–Cation Interactions |
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| Authors: | Dr Victor Mougel Lucile Chatelain Dr Johannes Hermle Dr Roberto Caciuffo Dr Eric Colineau Dr Floriana Tuna Dr Nicola Magnani Dr Arnaud de?Geyer Dr Jacques Pécaut Dr Marinella Mazzanti |
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| Institution: | 1. Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR‐E3 CEA‐UJF, INAC, CEA‐Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) http://inac.cea.fr/Pisp/51/marinella.mazzanti.html;2. European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, 76125 Karlsruhe (Germany);3. EPSRC UK EPR Facility, School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL (UK);4. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann‐von‐Helmholtz Platz 1, 76344 Eggenstein‐Leopoldshafen (Germany);5. Service Général des Rayons X, SP2M, INAC, CEA‐Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) |
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| Abstract: | Single‐chain magnets (SCMs) are materials composed of magnetically isolated one‐dimensional (1D) units exhibiting slow relaxation of magnetization. The occurrence of SCM behavior requires the fulfillment of stringent conditions for exchange and anisotropy interactions. Herein, we report the synthesis, the structure, and the magnetic characterization of the first actinide‐containing SCM. The 5f–3d heterometallic 1D chains {UO2(salen)(py)]M(py)4](NO3)}]n, (M=Cd ( 1 ) and M=Mn ( 2 ); py=pyridine) are assembled trough cation–cation interaction from the reaction of the uranyl(V) complex UO2(salen)py]Cp*2Co] (Cp*=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine. The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm?1), probably as a result of strong intra‐chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group. It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K. |
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| Keywords: | actinides cations polymetallic complexes single‐chain magnets uranium |
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