7-Chloro-4-[(E)-N'-(4-fluoro-benzyl-idene)hydrazin-yl]quinoline monohydrate.

The mol­ecule of the title hydrate, C16H11ClFN3·H2O, is slightly twisted, as indicated by the dihedral angle of 9.55 (10)° formed between the quinoline ring system and the benzene ring. The conformation about the C=N double bond is E, and the amine-H atom is oriented towards the quinoline residue. In the crystal structure, the water mol­ecule accepts an N—H⋯O and makes two O—H⋯Nquinoline hydrogen bonds, generating a two-dimensional array in the ab plane, which is further stabilized by C—H⋯O inter­actions. The most significant contacts between layers are of the type C—H⋯F.