A Heterometallic FeII-DyIII Single-Molecule Magnet with a Record Anisotropy Barrier.

A record anisotropy barrier (319 cm⁻¹) for all d-f complexes was observed for a unique Fe^II-Dy^III-Fe^II single-molecule magnet (SMM), which possesses two asymmetric and distorted Fe^II ions and one quasi- D_{5 h} Dy^III ion. The frozen magnetization of the Dy^III ion leads to the decreased Fe^II relaxation rates evident in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets. [ABSTRACT FROM AUTHOR]