Adeninium perchlorate adenine dihydrate

The structure of the title compound, C₅H₆N₅⁺·ClO₄⁻·C₅H₅N₅·2H₂O, contains both an adeninium cation (AdeH⁺) and an adenine mol­ecule (Ade). As a result of the protonation, the C—N—C angle at the protonated N atom is larger by 4° than the corresponding angle in the neutral adenine mol­ecule. The crystal packing is governed by classical hydrogen bonds, connecting the Ade and AdeH⁺ moieties in the crystallographic [101] direction. In addition, AdeH⁺ and Ade form hydrogen bonds with the water mol­ecules. These hydrogen bonds increase the dimensionality of the system to three-dimensional space. The water mol­ecules are connected to each other by hydrogen bonds in the [001] direction.