Three-dimensional network in piper­azine-1,4-diium–picrate–piperazine (1/2/1)

In the title compound, C(4)H(12)N(2) (2+)·2C(6)H(2)N(3)O(7) (−)·C(4)H(10)N(2), the piperazine-1,4-diium cations and piperazine mol­ecules lie on crystallographic inversion centres. In the crystal structure, inter­molecular N—H⋯O and N—H⋯N hydrogen bonds link the components to form two-dimensional layers parallel to the (001) plane. These layers are, in turn, connected by weak inter­molecular C—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distance between parallel aryl rings = 3.764 (2) Å, interplanar spacing = 3.500 (2) Å and ring offset = 1.387 (2) Å], forming a three-dimensional framework.