title: Crystal structure of 7-bromo-4-oxo-4H-chromene-3-carbaldehyde.
abstract: In the title compound, C10H5BrO3, a brominated 3-formyl-chromone derivative, all atoms are essentially coplanar (r.m.s. = 0.0631 Å for the non-H atoms), with the largest deviation from the least-squares plane [0.215 (3) Å] being for the formyl O atom. In the crystal, mol-ecules are linked into tapes through C-H⋯O hydrogen bonds and these tapes are assembled by stacking inter-actions [centroid-centroid distance between the pyran rings = 3.858 (3) Å] to form supra-molecular layers that stack along the c axis.
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: C—H⋯O hydrogen bonding; chromone; crystal structure; stacking inter­action