Cyanide

C N^{-}

. Its carbon end can act as a nucleophile toward an alkyl leaving group to form a nitrile with one additional carbon.

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Ferrocyanide ( $[Fe (CN)_{6}]^{4 -}$ )

Ferrocyanide is the hexacyanoferrate(II) anion,

[Fe (CN)_{6}]^{4 -}

. Six cyanide ligands surround formally iron(II), giving an approximately octahedral coordination complex.

One-electron oxidation gives ferricyanide without requiring loss of the whole ligand framework. Distinguishing a coordinated cyanide ligand from free cyanide is essential when describing the chemical species.

Dicyanoargentate ( $[Ag (CN)_{2}]^{-}$ )

The soluble silver–cyanide complex central to the two-cyanides-per-silver ratio in alkaline silver nitrate titration.

Silver cyanide ( $AgCN$ )

A white silver–cyanide solid used historically in gravimetric analysis of hydrogen cyanide. Excess cyanide can dissolve it as dicyanoargentate.

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