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The mol­ecule of the title compound, C16H14N2O3, is slightly non-planar, with a dihedral angle of 4.01 (1)° between the two benzene rings. In the crystal structure, mol­ecules are linked into chains by C—H⋯O inter­molecular hydrogen bonds. The crystal structure is stabilized by C—H⋯π and π–π inter­actions.

The mol­ecule of the title compound, C16H14N2O3, is slightly non-planar, with a dihedral angle of 3.3 (1)° between the two benzene rings. In the crystal structure, the mol­ecules are linked into centrosymmetric dimers by inter­molecular C—H⋯O hydrogen bonds.

In the title compound, C9H8N2O, all non-H atoms are essentially coplanar. N—H...O hydrogen bonds generate a centrosymmetric R 2 2(10) dimer.

The mol­ecule of the title compound, C17H16N2O3, is non-planar, with a dihedral angle of 15.3 (1)° between the two benzene rings. An intra­molecular C—H⋯O hydrogen bond forms a six-membered ring.

The title compound, C15H12N2O3, is non-planar, with a dihedral angle of 83.0 (1)° between the two benzene rings. The mol­ecules are linked into a ribbon along the b axis by inter­molecular C—H⋯O and O—H⋯N hydrogen bonds. The packing is further stabilized by C—H⋯π and π–π inter­actions.

In the title molecule, C13H21ClO2, there is an intramolecular C—H...Cl hydrogen bond. The conformation about the C=C bond is E and the six-membered ring has a chair conformation. In the crystal, molecules are linked by pairs of O—H...O hydrogen bonds, forming inversion dimers, which are consolidated by C—H...O hydrogen bonds. The dimers are linked via C—H.·O hydrogen bonds, forming chains along [100].

In the title compound, C12H15BrO2, the carboxyl group forms a dihedral angle of 78.4 (3)° with the benzene ring plane. In the crystal, molecules are linked into centrosymmetric dimers by pairs of O—H...O hydrogen bonds.

In the mol­ecule of the title compound, C16H15NO, all bond lengths and angles are within normal ranges. The dihedral angle between the two aromatic rings is of 62.80 (1)°. The crystal packing is stabilized by C—H⋯π inter­actions.

In the crystal structure of the title compound, C19H14N2O2, the mol­ecules are almost planar. The dihedral angle between the two aromatic ring systems is 3.67 (1)°.