Abstract
In the crystal structure of the title molecular salt, 3C
2
H
5
N
4
+
·HPO
4
2−
·H
2
PO
4
−
·3H
2
O, the phosphate-based framework is built upon layers parallel to (010) made up from the H
2
PO
4
−
and HPO
4
2−
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
sp
2
-hybridized C and N atoms.