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.
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