Dipotassium (2,2'-Bipyridyl-N,N')tetracyanoferrate(II) 2.5-Hydrate, K₂[Fe(bpy)(CN)₄].2.5H₂O

Analysis of the title complex, K₂[Fe(CN)₄(C₁₀H₈N₂)].2.5H₂O, shows that the asymmetric unit contains two [Fe(bpy)(CN)₄]^2- units, four K⁺ ions and five water molecules. There is extensive hydrogen bonding within the structure and, as expected, all hydrogen-bond donors and acceptors are involved in hydrogen bonding, resulting in a complex three-dimensional network. The water molecules and K⁺ ions occupy three different channels in the framework created by the packing of the [Fe(bpy)(CN)₄]^2- units.

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