4,4′-Methyl­enedianilinium bis­(3-carb­oxy-4-hydroxy­benzene­sulfonate) monohydrate

Co-crystallization of 4,4′-methyl­enediphenyl­amine (MDA) and 5-sulfosalicylic acid (5-H(2)SSA) yields the title salt, C(13)H(16)N(2) (2+)·2C(7)H(5)O(6)S(−)·H(2)O. The asymmetric unit is comprised of one dication, two anions and one water mol­ecule. In the crystal structure, the components of the salt are linked by a combination of inter­molecular O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds into a three-dimensional framework. In addition, two weak π–π inter­actions [with centroid–centroid distances of 3.8734 (15) and 3.7465 (15) Å] and one C—H⋯π inter­action further stabilize the crystal structure.