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Acta Cryst. (2013). C69, 1472-1477  [ doi:10.1107/S0108270113028977 ]

Coordination polymeric structures in the sodium salt of 4-chloro-3-nitro­benzoic acid and the sodium and potassium salts of 4-nitro­anthranilic acid

G. Smith

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 [pi]-[pi] 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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