Exploring orientationally aligned anisotropic large spin molecules with unusual long-distance intermolecular ferromagnetic interactions

Abstract

Anisotropic magnetic clusters are interesting materials because magnetic anisotropy and spin state are important factors in their magnetic properties. Although long-distance magnetic interactions have been observed in several assemblies of anisotropic magnetic molecules, these interactions are small and observed at extremely low temperature (typically below 2 K). In this work, to assemble orientationally aligned anisotropic large spin metal oxo clusters, we managed to synthesize a {V³⁺Mn₄³⁺} cluster with a large-spin (S_T = 9) ground state by utilizing an anisotropic lacunary polyoxometalate template. In the orientationally aligned clusters, unusual long-distance intermolecular ferromagnetic interactions were induced below 35 K under a small magnetic field (>0.01 T).