Tetra­quinolinium ditelluro(VI)octa­vanadate(V) octa­hydrate

In the title compound, (C₉H₈N)₄[Te₂V₈O₂₈]·8H₂O, the com­plete heteropolyanion is generated by a crystallographic inversion centre. One of the two quniolinium ions forms an N—H...O_p (p = polyoxidometallate) hydrogen bond and the other an N—H...O_w (w = water) hydrogen bond. The water mol­ecules further link the components by O—H...O_p and O—H...O_w hydrogen bonds. A number of C—H...O inter­actions and aromatic π–π stacking inter­actions [shortest centroid–centroid separation = 3.541 (7) Å] are also observed. Together, these generate a three-dimensional network.