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

In the asymmetric unit of the title compound, C(16)H(16)N(4)O(3)·H(2)O, 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) Å] are observed, together with O⋯O [2.7226 (11) Å], O⋯N [2.7072 (10) Å] and N⋯O [2.7072 (10)–2.8582 (12) Å] short contacts. The hydrazine mol­ecules are stacked along the b axis and adjacent mol­ecules are linked by water mol­ecules.