Bis(4-amino­pyridinium) μ(6)-oxido-dodeca-μ(2)-oxido-hexaoxido[rhenium(VII)tetratungsten(VI)vanadium(V)]ate hepta­hydrate

In the title organic–inorganic hybrid compound, (C(5)H(7)N(2))(2)[ReVW(4)O(19)]·7H(2)O, the Lindqvist-type polyoxido anion has crystallographically imposed mm2 symmetry and is built up by six MO(6) (M = W, V, Re) edge-sharing distorted octa­hedra. The Re and V atoms share the same crystallographic site in a 0.5:0.5 ratio. The 4-amino­pyridinium cations lie on a mirror plane. Three of the four independent water O atoms in the asymmetric unit are located on a mirror plane whereas the remaining O atom has mm2 site symmetry. In the crystal, the cations, anions and water mol­ecules are linked into a three-dimensional network through O—H⋯O and N—H⋯O hydrogen-bonding inter­actions.