N'-[(Z)-4-(Dimethyl-amino)benzyl-idene]-4-nitro-benzohydrazide mono-hydrate.

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 mol-ecules with almost identical geometries, and two independent water mol-ecules. The dihedral angles between the two benzene rings in the two hydrazide mol-ecules are 0.11†(5) and 0.77†(5)°. In one mol-ecule, an intra-molecular C-H⋯O hydrogen bond generates a ring of graph-set motif S(5). Inter-molecular N-H⋯O, O-H⋯O, O-H⋯N and C-H⋯O hydrogen bonds and π-π stacking inter-actions between the benzene rings [centroid-centroid distances in the range 3.5021†(6)-3.6403†(6)†à ] are observed, together with O⋯O [2.7226†(11)†à ], O⋯N [2.7072†(10)†à ] and N⋯O [2.7072†(10)-2.8582†(12)†à ] short contacts. The hydrazine mol-ecules are stacked along the b axis and adjacent mol-ecules are linked by water mol-ecules.