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In the title compound, C15H13FN2O, the dihedral angle between the benzene rings is 16.9 (2)°. The F atom and the O atom are in a syn conformation. In the crystal, molecules are linked by N—H...O hydrogen bonds to generate C(4) chains propagating along the b-axis direction.

In the title compound, C15H13N3O3, the dihedral angle between the benzene rings is 1.01 (3)° and that between the nitro group and its attached ring is 5.99 (15)°. In the crystal, molecules are linked by N—H...O hydrogen bonds generating C(4) chains along [010].

In the title molecule, C15H13BrN2O2, an intramolecular O—H...N hydrogen bond influences the molecular conformation; the two benzene rings form a dihedral angle of 13.6 (3)°. In the crystal, intermolecular N—H...O hydrogen bonds link the molecules into chains along the a axis and weak intermolecular C—H...O hydrogen bonds further link these chains into layers parallel to the ac plane.

In the molecule of the title compound, C17H13N3O2, the naphthyl ring system and the pyridine ring form a dihedral angle of 12.2 (3)°. An intramolecular O—H...N hydrogen bond generates a six-membered ring with an S(6) ring motif. This also contributes to the relative overall near planarity of the molecule [r.m.s. deviation of all 22 non-H atoms = 0.107 (5) Å]. In the crystal, molecules are linked through intermolecular N—H...N hydrogen bonds, forming chains along the a axis.

In the hydrazone molecule of the title compound, C15H12ClN3O4·H2O, the two benzene rings form a dihedral angle of 3.6 (1)°. In the crystal structure, the solvent water molecules are involved in the formation of intermolecular N—H...O and O—H...N hydrogen bonds, which link the molecules into double ribbons extending along the b axis. Intermolecular π–π interactions between the aromatic rings [centroid–centroid distances = 3.712 (3) and 3.672 (3) Å] link these ribbons further into layers parallel to the ab plane.

In the hydrazone molecule of the title compound, C13H9I2N3O2·CH3CN, the aromatic rings form a dihedral angle of 9.4 (3)°. In the crystal structure, intermolecular I...N interactions [3.099 (4) Å] link hydrogen-bonded aggregates of the hydrozone and solvent molecules related by translation along the b axis into chains. An intramolecular O—H...N hydrogen bond forms an S(6) ring.

In the title compound, C19H16N2O2, the benzene ring and naphthyl ring system are inclined at a dihedral angle of 16.1 (3)°. An intramolecular O—H...N hydrogen bond influences the molecular conformation. In the crystal, molecules are linked through N—H...O hydrogen bonds into chains running along the a axis.

In the title compound, C15H13BrN2O3, the two benzene rings form a dihedral angle of 16.9 (2)°. An intramolecular O—H...N hydrogen bond affects the molecular conformation. In the crystal structure, molecules are linked through N—H...O hydrogen bonds into chains running along the a axis.

In the title compound, C17H19N3O2, the two benzene rings form a dihedral angle of 89.2 (2)°. In the crystal structure, molecules are linked through N—H...O hydrogen bonds, forming C(4) chains running along the c axis.

In the title compound, C15H13BrN2O3, the molecule adopts an E configuration about the C=N bond and the two benzene rings form a dihedral angle of 20.3 (3)°. In the molecule, there are two intramolecular hydrogen bonds, viz. O—H...N and N—H...O, involving the hydroxy substituent, the methoxy O atom and the hydrazide NH group and N atom. In the crystal structure, molecules are linked through N—H...O hydrogen bonds, forming chains propagating along [010].

In the title compound, C15H13BrN2O4·CH4O, the two benzene rings form a dihedral angle of 3.2 (2)°. An intramolecular O—H...N hydrogen bond is observed. In the crystal structure, molecules are linked through O—H...O and N—H...O hydrogen bonds, forming a two-dimensional network parallel to (10overline{1}).

In the title compound, C14H11N3O4, the two benzene rings form a dihedral angle of 45.3 (3)°. The nitro group is twisted out of the attached ring by a dihedral angle of 37.5 (3)°. In the crystal structure, molecules are linked into a two-dimensional network parallel to (100) by O—H...O and N—H...O hydrogen bonds.