N'-(2-Hydroxy-benzyl-idene)-2-methoxy-benzohydrazide monohydrate.

In the title compound, C(15)H(14)N(2)O(3)·H(2)O, the Schiff base mol-ecule is approximately planar, with a dihedral angle between the two aromatic rings of 10.2 (3)°. The mol-ecular structure is stabilized by O-H⋯N and N-H⋯O hydrogen bonds. In the crystal structure, the Schiff base and water mol-ecules are linked together by inter-molecular O-H⋯O hydrogen bonds, forming chains parallel to the a axis.

4-Chloro-N'-(2-hydroxy-benzyl-idene)benzohydrazide monohydrate.

The asymmetric unit of the title compound, C(14)H(11)ClN(2)O(2)·H(2)O, contains a Schiff base mol-ecule and a water mol-ecule of crystallization. The dihedral angle between the two aromatic rings is 27.3 (4)°. In the crystal structure, mol-ecules are linked into a two-dimensional network parallel to the bc plane by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds involving the water mol-ecules.

2-Meth-oxy-N'-(2-methoxy-benzyl-idene)benzohydrazide.

The title Schiff base compound, C(16)H(16)N(2)O(3), was derived from the condensation of 2-methoxy-benzaldehyde with 2-methoxy-benzohydrazide in an ethanol solution. The dihedral angle between the two aromatic rings is 87.5 (3)°. In the crystal structure, the mol-ecules are linked into chains running parallel to the a axis by inter-molecular N-H⋯O hydrogen bonds.