Synthesis and magnetic properties of Mn-12-Based single molecular magnets with benzene and pentafluorobenzene carboxylate ligands
2011 (English)In: Journal of Superconductivity and Novel Magnetism, ISSN 1557-1939, Vol. 24, no 1-2, 855-859 p.Article in journal (Refereed) Published
We report on the synthesis and magnetic properties of Mn12-based single molecular magnets (SMMs) with benzene and pentafluorobenzene carboxylate ligands. The changes in ligand structure are shown to have a decisive effect on the magnetic properties of the complexes produced. The compound with benzene demonstrates an unusual magnetic behavior, namely, temperature dependencies of magnetization taken under the zero-field-cooled and field-cooled conditions are split below 10 K and furthermore remnant magnetization and coercive force remain nonzero in this temperature range. In contrast, the compound with pentafluorobenzene displays the customary signatures of the blocking temperature at 3 K. The effect of ligand substitution was theoretically studied within the local density approximation taking into account on-site Coloumb repulsion. Calculation results confirm that the electronic structure and the magnetic exchange interactions between different Mn atoms strongly depend on the type of ligand.
Place, publisher, year, edition, pages
2011. Vol. 24, no 1-2, 855-859 p.
Mn12, SMM, agnetic properties
IdentifiersURN: urn:nbn:se:umu:diva-44084DOI: 10.1007/s10948-010-1030-3OAI: oai:DiVA.org:umu-44084DiVA: diva2:418064