Acta Cryst. (2013). C69, 1472-1477 [ doi:10.1107/S0108270113028977 ]
Synopsis: The hydrated sodium salt of 4-chloro-3-nitrobenzoic acid and the hydrated sodium and potassium salts of 2-amino-4-nitrobenzoic acid are stabilized by intra- and intermolecular hydrogen bonding and strong - ring interactions. Na centres are linked through centrosymmetric four-membered duplex water bridges and through 18-membered duplex head-to-tail ligand bridges. Similar centrosymmetric bridges are found in the potassium salt.
Formula: [Na(C7H3ClNO4)(H2O)], [Na(C7H5N2O4)(H2O)2] and [K(C7H5N2O4)(H2O)]
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