The title mol­ecule, C16H14O3, is slightly distorted from planarity, the dihedral angle between the two benzene rings being 9.51 (7)°. The configuration of the keto group with respect to the olefinic double bond is s‐cis. O—H⋯O hydrogen bonds, and C—H⋯O and π–π interactions, link the mol­ecules to form a three‐dimensional network. The C—H⋯O interactions form rings of graph‐set motifs S(5), (6) and (7).

The title mol­ecule, C15H11BrO2, is approximately planar and the dihedral angle between the two aromatic rings is 10.2 (2)°. The H atoms of the central enone moiety are trans. The mol­ecules form centrosymmetric hydrogen‐bonded dimers via intermolecular O—H⋯O hydrogen bonds (H⋯O = 2.02 Å and O—H⋯O = 172°).

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.003 Å Disorder in main residue R factor = 0.055 wR factor = 0.169 Data-to-parameter ratio = 12.6For details of how these key indicators were automatically derived from the article, see

The title mol­ecule, C15H12BrNO, is approximately planar and the dihedral angle between the two aromatic rings is 9.6 (1)°. The crystal packing reveals that the mol­ecules translated by one unit cell along the a‐axis direction are linked into a chain by inter­molecular N—H⋯O and C—H⋯O hydrogen‐bonding inter­actions. The screw‐related mol­ecules of adjacent chains are linked via N—H⋯N hydrogen bonds into a sheet‐like structure parallel to the ab plane.

Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.002 Å R factor = 0.035 wR factor = 0.096 Data-to-parameter ratio = 32.7For details of how these key indicators were automatically derived from the article, see