Ethane-1,2-diaminium dipicrate dihydrate

The title compound, C(2)H(10)N(2) (2+)·2C(6)H(2)N(3)O(7) (−)·2H(2)O, crystallizes with a complete picrate anion and half an ethyl­enediammonium dication on a mirror plane, and two half-water mol­ecules (both on a mirror plane) in the asymmetric unit. The N atoms from separate half ethyl­enediammonium dications are in near proximity to a phenolate O atom and two o-NO(2) groups from the picrate anion, which, along with the water mol­ecule form N—H⋯O, O—H⋯O and weak intermolecular C—H⋯O hydrogen bonds that create cyclic patterns with graph-set descriptors R (2) (4)(8), R (4) (4)(12), and R (4) (4)(16). The crystal packing is strongly influenced by these inter­molecular inter­actions between symmetry-related water mol­ecules, the half ethyl­enediammonium dication and the picrate anion, forming a three-dimensional supermolecular structure.