Crystal structure of [tris(4,4-bipyridine)]diium bis(1,1,3,3-tetracyano-2-ethoxypropenide) trihydrate

In the title hydrated salt, which was obtained from the hydro­thermal reaction between between potassium 1,1,3,3-tetra­cyano-2-eth­oxy­propenide and 4,4′-bi­pyridine in the presence of iron(II) sulfate hepta­hydrate, the ionic components are linked into a three-dimensional network by C—H⋯N hydrogen bonds.