Acta Cryst. (2014). C70, 315-319 [ doi:10.1107/S2053229614002459 ]
Synopsis: The hydrogen-bonded two- and three-dimensional polymeric structures in the ammonium salts of 3,5-dinitrobenzoic acid, 4-nitrobenzoic acid and 2,4-dichlorobenzoic acid involve cation-anion N-HO hydrogen-bonded cyclic associations. The presence or absence of the ring-stacking and ring-laddering models for ammonium carboxylate structures is also tested particularly with respect to the hydrated examples.
Formula: NH4+ salts of C7H3N2O6-, C7H4NO4-·2H2O and C7H3Cl2O2-·0.5H2O
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