The {Re} Tetrahedral Cyanometalate Cluster Anion [{Re(μ-CCN)}(CN)] with Inner (μ-CCN) Ligands and Its Features in Coordination of Cu Cations.

A reaction between ReI and KCN at elevated temperature led to the formation of the new cyanometalate cluster anion [{Re(μ-CCN)}(CN)] (). The anion contains μ-CCN ligands, which are stabilized by the coordination to the triangular faces of the tetrahedral {Re} metallocluster in a μ mode. The compound crystallized as a potassium salt, and its crystal structure was determined by single-crystal X-ray diffraction analysis. It was shown that μ-CCN ligands are ambidentate and can interact with transition-metal cations similarly to terminal CN groups, resulting in the polymer framework formation.