title: Crystal structure of 8-bromo-4-oxo-4H-chromene-3-carbaldehyde.
abstract: In the title compound, C10H5BrO3, a brominated 3-formyl-chromone, all atoms are essentially coplanar (r.m.s. = 0.0104 Å for the non-H atoms), with the largest deviation from the least-squares plane [0.028 (5) Å] being for one of the benzene C atoms. In the crystal, mol-ecules are linked through C-H⋯O hydrogen bonds, which are further assembled by face-to-face π-π stacking inter-actions [centroid-centroid distance between the pyran rings = 3.854 (4) Å]. Shorter contacts than the sum of van der Waals radii are observed between the Br and formyl O atoms [Br⋯O = 3.046 (4) Å, C-Br⋯O = 175.23 (18)° and Br⋯O-C = 132.6 (3)°], features that do indicate halogen bonding.
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Ishikawa
keywords: chromone; crystal structure; halogen bonding; hydrogen bonding; π–π stacking