[Mn18]2+ and [Mn21]4+ single-molecule magnets |
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| Institution: | 1. Department of Chemistry and Center for X-ray Crystallography, University of Florida, Gainesville, FL 32611-7200, USA;2. Department of Chemistry, Indiana University, Bloomington, IN 47405-7102, USA;3. Laboratoire Louis Néel-CNRS, 38042 Grenoble Cedex 9, France;4. Department of Chemistry, University of California at San Diego, La Jolla, CA 92093-0358, USA;5. Institute for Solid State Physics, University of Tokyo, 7-22-1 Roppongi, Minatoku, Tokyo 106-8666, Japan;6. Department of Chemistry, University of Delaware, Newark, DE 19716, USA;1. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK;2. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China;2. Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, 57045 Metz, France;3. Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, 57045 Metz, France;4. Taiyuan University of Science and Technology, Taiyuan 030024, China;1. State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, People’s Republic of China;2. Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People’s Republic of China |
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| Abstract: | The synthesis and structural characterization of the two new Mn complexes Mn18O14(O2CMe)18(hep)4(hepH)2(H2O)2](ClO4)2 (1) and Mn21O16(O2CMe)16(hmp)6(hmpH)2(pic)2(py)(H2O)](ClO4)4 (3) are presented, together with a detailed study of their magnetic properties. Complex 1 possesses a ground-state spin of S=13, and the ground-state spin for 3 is estimated to be S=17/2 or 19/2. Both complexes 1 and 3 are new examples of single-molecule magnets (SMMs), displaying frequency-dependent out-of-phase AC signals, as well as magnetization vs. DC field hysteresis at temperatures below 1 K. Complex 1 straddles the classical/quantum interface by also displaying quantum tunneling of the magnetization (QTM). |
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