Tris(5-amino-1H-1,2,4-triazol-4-ium) dihydrogenphosphate hydrogen­phosphate trihydrate

In the crystal structure of the title molecular salt, 3C₂H₅N₄⁺·HPO₄²⁻·H₂PO₄⁻·3H₂O, the phosphate-based framework is built upon layers parallel to (010) made up from the H₂PO₄⁻ and HPO₄²⁻ anions and water mol­ecules, which are inter­connected through O—H...O hydrogen bonds. The organic cations are located between the phosphate–water layers and are connected to them via N—H...O hydrogen bonds. The bond-length features are consistent with an imino resonance form for the exocyclic amino group, as is commonly found for a C—N single bond involving sp²-hybridized C and N atoms.