4-Meth­oxy-N′-(4-meth­oxy­benzyl­idene)benzohydrazide

The title compound, C16H16N2O3, was prepared by the reaction of 4-meth­oxy­benzaldehyde with 4-meth­oxy­benzohydrazide in methanol. The dihedral angle between the two benzene rings is 3.1 (3)°. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into C(4) chains along the b axis

N′-(2-Chloro­benzyl­idene)-2-fluoro­benzohydrazide

The title hydrazone compound, C14H10ClFN2O, adopts an E configuration about the C=N double bond. The dihedral angle between the two substituted benzene rings is 11.6 (2)°. The F atom is disordered over two sites with occupancies of 0.488 (2) and 0.512 (2). In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the a axis. C—H⋯F and C—H⋯O inter­actions also occur

N′-(4-Hy­droxy­benzyl­idene)-2-methyl­benzohydrazide

The title hydrazone compound, C15H14N2O2, was prepared by the condensation of 4-hy­droxy­benzaldehyde with 2-methyl­benzohydrazide in methanol. The dihedral angle between the two benzene rings is 42.3 (2)°. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, forming a three-dimensional framework

N′-(2,4-Dichloro­benzyl­idene)-2-methyl­benzohydrazide

In the title hydrazone compound, C15H12Cl2N2O, the dihedral angle between the two benzene rings is 12.2 (2)°. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming forming C(4) chains propagating in [001]

N′-(3,5-Dibromo-2-hy­droxy­benzyl­idene)-2-methyl­benzohydrazide

The asymmetric unit of the title compound, C15H12Br2N2O2, contains two independent mol­ecules in which the dihedral angles between the benzene rings are 49.5 (7) and 66.4 (7)°. Intra­molecular O—H⋯N hydrogen bonds generate S(6) ring motifs in each mol­ecule. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the b axis

N′-(4-Hy­droxy­benzyl­idene)-3-meth­oxy­benzohydrazide

In the title compound, C15H14N2O3, the dihedral angle between the two benzene rings is 47.9 (3)°. In the crystal, mol­ecules are linked through N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds, forming layers parallel to the ab plane

N′-(5-Bromo-2-hy­droxy­benzyl­idene)-3-nitro­benzohydrazide methanol mono­solvate

In the title compound, C14H10BrN3O4·CH4O, the dihedral angle between the two benzene rings in the hydrazone mol­ecule is 5.8 (3)° and an intra­molecular O—H⋯N hydrogen bond generates an S(6) ring motif. An O—H⋯O hydrogen bond occurs between the hydrazone mol­ecule and the methanol solvent mol­ecule. In the crystal, the components are linked by inter­molecular N—H⋯O hydrogen bonds, forming chains along the a axis

N′-(2-Hy­droxy-3,5-diiodo­benzyl­idene)-2-methyl­benzohydrazide

The asymmetric unit of the title compound, C15H12I2N2O2, contains two independent mol­ecules in which the dihedral angles between the two benzene rings are 62.4 (7) and 41.1 (7)°. Intra­molecular O—H⋯N hydrogen bonds generate S(6) ring motifs in each mol­ecule. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the a axis

4-Chloro-N′-(3,5-dibromo-2-hy­droxy­benzyl­idene)benzohydrazide

The asymmetric unit of the title compound, C14H9Br2ClN2O2, contains two independent mol­ecules. Both mol­ecules adopt an E configuration about the C=N bond. The dihedral angles between the benzene rings are 30.0 (2) and 51.6 (2)° in the two mol­ecules. In the crystal, mol­ecules are linked through N—H⋯O hydrogen bonds, forming chains along the b axis. In addition, there is an intra­molecular O—H⋯N hydrogen bond in each mol­ecule

(E)-N′-(3-Hy­droxy­benzyl­idene)-3-nitro­benzohydrazide

The title compound, C14H11N3O4, was prepared by the reaction of 3-nitro­benzohydrazide with 3-hy­droxy­benzalde­hyde. The mol­ecule adopts an E configuration about the C=N bond. The dihedral angle between the two benzene rings is 32.3 (2)°. In the crystal, the mol­ecules are linked through inter­molecular N—H⋯O, O—H⋯N, and O—H⋯O hydrogen bonds, forming chains in the a-axis direction