Acta Cryst. (2013). E69, o574-o575 [ doi:10.1107/S160053681300723X ]
Abstract: In the title hydrated salt, C4H12N22+·2C10H5O8-·2H2O, the piperazinediium cation, lying about an inversion center, adopts a chair conformation. The benzene ring of the anion makes dihedral angles of 25.17 (8)° with the carboxylate group and angles of 8.50 (7), 20.07 (7) and 80.86 (8)° with the three carboxylic acid groups. In the crystal, the cations, anions and water molecules are connected by O-HO and N-HO hydrogen bonds into double layers parallel to (110).
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