Crystal structure of (E)-4-hy­droxy-N′-(3-hy­droxy­benzyl­idene)benzohydrazide monohydrate

In the title benzohydrazide hydrate, C(14)H(12)N(2)O(3)·H(2)O, the dihedral angle between the aromatic rings is 58.11 (6)° and the C=O and N—H groups adopt an anti orientation. The main twist in the mol­ecule occurs about the C(=O)—C(ar) (ar = aromatic) bond, with an N—C(=O)—C(ar)—C(ar) torsion angle of −43.5 (2)°. In the crystal, the components are linked by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds. These inter­actions generate [10-1] chains, with adjacent organic mol­ecules linked by inversion symmetry generating either pairs of N—H⋯O links [R (2) (2)(16) loops] or pairs of O—H⋯O links [R (2) (2)(20) loops]. Pairs of water mol­ecules are located in the R (2) (2)(20) loops and form their own O—H⋯O and O—H⋯N hydrogen bonds to adjacent organic mol­ecules in the chain. Finally, an inter­chain O—H⋯O hydrogen-bond link from the 4-hy­droxy group generates (010) sheets.