Bis(4-amino­pyridinium) tetra­iodido­cad­mate monohydrate

The title compound, (C(5)H(7)N(2))(2)[CdI(4)]·H(2)O, contains one [CdI(4)](2−) anion, two prontonated 4-amino­pyridine mol­ecules and one water mol­ecule in the asymmetric unit. In the anion, the Cd(II) atom is coordinated by four I atoms in a slightly distorted tetra­hedral geometry. The [CdI(4)](2−) anion and the water mol­ecule are bis­ected by a crystallographic mirror plane perpendicular to the c-axis direction, with the Cd(II) atom, two of the I atoms and the atoms of the water mol­ecule located on this plane. The crystal packing is stabilized by inter­molecular N—H⋯I, N—H⋯O and O—H⋯I hydrogen bonds and by π–π stacking inter­actions [centroid–centroid distance = 3.798 (3) Å) between pyridine rings, which build up a three-dimensional network.