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Sodium 3,5-di­nitro­benzoate, Na+·C7H3N2O6-, was obtained by evaporation at room temperature of an aqueous solution of ethyl­enedi­ammonium 3,5-di­nitro­benzoate in sodium hydrox­ide. The structure is trigonal and the benzoate ion has twofold crystallographic symmetry.

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The co-crystal of ethyl­enediammonium bis­(3,5-dinitro­benzoate) and 3,5-dinitro­benzoic acid, namely ethyl­enediaminium-3,5-dinitro­benzoate-3,5-dinitro­benzoic acid (1/2/2), C2H10N22+·2C7H3N2O6-·2C7H4N2O6, has as the asymmetric unit one 3,5-dinitro­benzoic acid mol­ecule, one 3,5-dinitro­benzoate ion and one-half of the ethyl­enediammonium ion, as this cation lies on an inversion centre. Each ethyl­enediammonium ion is hydrogen bonded to four benzoate ions and two benzoic acid mol­ecules.
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