N′-[(E)-1-(5-Chloro-2-hy­droxy­phen­yl)ethyl­idene]pyridine-3-carbohydrazide monohydrate

In the title compound, C(14)H(12)ClN(3)O(2)·H(2)O, the benzene ring and the pyridine rings are oriented at a dihedral angle of 57.73 (12)° and an intra­molecular O—H⋯N hydrogen bond generates an S(6) ring. In the crystal, the water mol­ecule forms O—H⋯O and O—H⋯N hydrogen bonds to the organic mol­ecule, leading to chains containing R (4) (4)(16) loops. In addition, weak aromatic π–π stacking inter­actions between the centroids of pyridine rings [at distance of 3.864 (2) and 4.013 (2) Å] and C—H⋯π inter­actions occur.