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In the the title cocrystal, C7H8N4O2·C7H6O4·H2O, the three mol­ecules form an S(6) and a C22(8) ring by intra- and inter­molecular hydrogen bonds, respectively. Finally, these components are organized into an infinite two-dimensional network via hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title salt, C6H18N22+·2C7H3N2O6−, contains 3,5-dinitro­benzoate anions and hexa­methyl­enediammonium dications, the latter lying on inversion centres. These ions inter­act by way of N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title salt, C5H7N2+·C7H5O4−,anions are linked through O—H⋯O hydrogen bonds into an infinite C22(16) chain parallel to the [010] direction. Adjacent chains are further organized into a three-dimensional supra­molecular structure based on N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]