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In the title compound, C(16)H(16)N(2)O(4)·H(2)O, the dihedral angle between the two benzene rings is 12.4 (2)° and the mol-ecule adopts an E configuration with respect to the C=N bond. There are intra-molecular O-H⋯N and O-H⋯O hydrogen bonds in the hydrazone mol-ecule, which both generate S(6) rings. In the crystal structure, mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds, forming layers parallel to the ab plane. The crystal studied was a non-merohedral twin with a domain ratio of 0.887 (3):0.113 (3).

In the title compound, C(15)H(14)N(2)O(4), the dihedral angle between the two benzene rings is 4.1 (2)°. The mol-ecule adopts an E configuration with respect to the C=N bond. There are intra-molecular O-H⋯N and O-H⋯O hydrogen bonds in the mol-ecule. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds, forming chains running along the c axis.

In the title compound, C(16)H(15)N(3)O(6), the dihedral angle between the two benzene rings is 0.9 (2)°. The mol-ecule adopts an E configuration with respect to the C=N bond. There are intra-molecular O-H⋯N and O-H⋯O hydrogen bonds in the mol-ecule. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds to form chains running along the c axis.

The asymmetric unit of the title compound, C(15)H(13)N(3)O(7)·2H(2)O, consists of a hydrazone mol-ecule and two solvent water mol-ecules. The mol-ecule adopts an E configuration with respect to the C=N bond. It is relatively planar, with a dihedral angle between the two benzene rings of 2.6 (1)°. There are intra-molecular O-H⋯N and O-H⋯O hydrogen bonds in the hydrazone mol-ecule. In the crystal structure, symmetry-related mol-ecules are linked through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds to form a three-dimensional network.

In the title compound, C(15)H(14)N(2)O(5), the dihedral angle between the two benzene rings is 4.3 (3)° and the mol-ecule adopts an E configuration with respect to the C=N bond. Intra-molecular O-H⋯N and N-H⋯O hydrogen bonds are observed. In the crystal structure, the mol-ecules are linked through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds to form layers parallel to the ac plane.

In the title compound, C(16)H(16)N(2)O(5), the dihedral angle between the two benzene rings is 8.5 (3)° and the mol-ecule adopts an E configuration with respect to the C=N bond. There is an intra-molecular N-H⋯O hydrogen bond in the mol-ecule, which generates an S(6) ring. In the crystal, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming layers parallel to the bc plane.

In the title compound, C(15)H(13)ClN(2)O(2), the dihedral angle between the two benzene rings is 3.4 (5)° and the mol-ecule adopts an E configuration with respect to the C=N bond. There is an intra-molecular O-H⋯O hydrogen bond in the mol-ecule, which generates an S(6) loop. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds, forming C(4) chains running along the a axis.