A Heterometallic Fe-II-Dy-III Single-Molecule Magnet with a Record Anisotropy Barrier

Abstract

A record anisotropy barrier (319 cm-1) for all d-f complexes was observed for a unique FeII-DyIII-FeII single-molecule magnet (SMM), which possesses two asymmetric and distorted FeII ions and one quasi-D5h DyIII ion. The frozen magnetization of the DyIII ion leads to the decreased FeII relaxation rates evident in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets. A record anisotropy barrier of 319 cm-1 was observed for a FeII-DyIII-FeII single-molecule magnet, which possesses two asymmetric and distorted FeII ions and one quasi-D5h DyIII ion. The frozen magnetization of the DyIII ions leads to the slowed relaxation of the FeII ions in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets.