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 SM ISO690:2012PRODIUS, Denis, MERIAKRE, V., LIPKOWSKI, Janusz, KAUR, N, DALAL, N, TURTA, Constantin. The search for 3d-4f single-molecule magnets: synthesis, structure, and magnetism of manganese-lanthanide complexes. In: Physical Methods in Coordination and Supramolecular Chemistry, 27 septembrie - 1 octombrie 2006, Chişinău. Chisinau, Republic of Moldova: 2006, XVII, p. 169. ISBN 978-9975-62-066-6. |
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| Physical Methods in Coordination and Supramolecular Chemistry XVII, 2006 |
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Conferința "The XV-th International Conference Physical Methods in Coordination and Supramolecular Chemistry : The XVII-th Reading in memory of Acad. A.Ablov" Chişinău, Moldova, 27 septembrie - 1 octombrie 2006 | ||||||
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Earlier, the search for SMMs was almost based on the use of 3d metal ions. Another approach is to include metal ions that exhibit high spin and single ion anisotropy. For this reason, lanthanidecontaining molecules with strong spin-orbit interactions are very good candidates for SMM behavior. Reaction of manganese acetate, europium nitrate and benzoic acid in toluene affords a pentadecanuclear [Mn11Eu4O8(OH)8(PhCOO)18(NO3)2(H2O)6]NO3 .4CH3CN cluster (1), while the same reaction in excess of benzoic acid and neodymium nitrate gives a highly asymmetric dodecanuclear mixed-metal cluster [Mn10Nd2O9(PhCOO)18] (2).figureMagnetic susceptibility for 2 was measured under 0.01 T field in the temperature range 1.8300K. The χmT value at 300 K is 32-33 emu K mol-1, slightly lower than that expected for ten noninteracting Mn(III) and two Nd(III) (4f3) ions (10*3.001+2*1.64 = 33.29 cm3 K mol-1). The lowering of χMT observed between 50 and 1.8 K may then be attributed to existence of antiferromagnetic interactions between the metal centers. The magnetic properties are described. |
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