N′-[(Z)-4-(Dimethylamino)benzylidene]-4-nitrobenzohydrazide monohydrate

In the asymmetric unit of the title compound, C16H16N4O3·H2O, there are two symmetry-independent hydrazide molecules with almost identical geometries, and two independent water molecules. The dihedral angles between the two benzene rings in the two hydrazide molecules are 0.11 (5) and 0.77 (5)°. In one molecule, an intramolecular C—H...O hydrogen bond generates a ring of graph-set motif S(5). Intermolecular N—H...O, O—H...O, O—H...N and C—H...O hydrogen bonds and π–π stacking interactions between the benzene rings [centroid–centroid distances in the range 3.5021 (6)–3.6403 (6) ] are observed, together with O...O [2.7226 (11) ], O...N [2.7072 (10) ] and N...O [2.7072 (10)–2.8582 (12) ] short contacts. The hydrazine molecules are stacked along the b axis and adjacent molecules are linked by water molecules.