Cyanide-Bridged Single-Molecule Magnet Constructed by an Octacoordinated [W(CN)₆(bpy)]^- Anion

Two cyanide-bridged W^V−M [M = Mn^III (1), Co^II (2)] bimetallic clusters were prepared by self-assembling a new molecular precursor [W(CN)₆(bpy)]^- and the corresponding metal complexes. Compound 1 shows a tetranuclear W₂Mn₂ entity, consisting of a Jahn−Teller ion, Mn^III, which serves as an anisotropic source, while compound 2 exhibits a trimeric W₂Co structure. Among them, compound 1 displays slow relaxation of the magnetization, which is typical of a single-molecule magnet behavior.