Received 1 September 2008
Co-crystallization of 4,4'-methylenediphenylamine (MDA) and 5-sulfosalicylic acid (5-H2SSA) yields the title salt, C13H16N22+·2C7H5O6S-·H2O. 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-HO, N-HO and weak C-HO hydrogen bonds into a three-dimensional framework. In addition, two weak - interactions [with centroid-centroid distances of 3.8734 (15) and 3.7465 (15) Å] and one C-H interaction further stabilize the crystal structure.
Data collection: SMART (Bruker, 2007); cell refinement: SAINT-Plus (Bruker, 2007); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH2691 ).
This work was supported by the National Natural Science Foundation of China under grant Nos. 10574047, 10574048 and 20490210. This work was also supported by the National 973 Project under grant No. 2006CB921605.
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