4,4′-(Ethene-1,2-di­yl)dipyridinium 4-[2-(pyridin-4-yl)ethen­yl]pyridinium octa­cyanidomolybdate(V) tetra­hydrate

The crystal structure of the title compound, (C(12)H(12)N(2))(C(12)H(11)N(2))[Mo(CN)(8)]·4H(2)O, consists of 4,4′-(ethene-1,2-di­yl)dipyridinium and 4-[2-(pyridin-4-yl)ethen­yl]pyridinium cations disordered over the same site, an [Mo(CN)(8)](3−) anion and four water mol­ecules of crystallization. The eight-coordinate [Mo(CN)(8)](3−) unit exhibits a slightly distorted square-anti­prismatic geometry. In the structure, the cations (crystallographic symmetry, 2) and anions (crystallographic symmetry, 222) are arranged alternately by N—H⋯O and O—H⋯N hydrogen bonds, forming layers parallel to the bc plane. These layers are further linked through O—H⋯N hydrogen bonds, generating a three-dimensional supra­molecular network.