Benzene-1,2-diaminium bis(hydrogen phosphonate)

The asymmetric unit of the title mol­ecular salt, C6H10N22+·2H2PO3−, contains half of a benzene-1,2-diaminium cation and a phosphite anion, the complete cation being generated by a crystallographic mirror plane. In the crystal, N—H⋯O hydrogen bonds generate R22(9) and R22(8) ring motifs and O—H⋯O hydrogen bonds generate an R22(8) ring motif. Overall, these generate a three-dimensional framework. The crystal structure also features π–π inter­actions [centroid-to-centroid distance = 3.8642 (7) A].