title: 6-Chloro-7-fluoro-4-oxo-4H-chromene-3-carbaldehyde.
abstract: In the title compound, C10H4ClFO3, a chlorinated and fluorinated 3-formyl-chromone derivative, all atoms are essentially coplanar (r.m.s. = 0.0336 Å for the non-H atoms), with the largest deviation from the least-squares plane [0.062 (2) Å] being for a benzene-ring C atom. In the crystal, mol-ecules are linked through stacking inter-actions [centroid-centroid distance between the benzene and pyran rings = 3.958 (3) Å and inter-planar distance = 3.259 (3) Å], C-H⋯O hydrogen bonds, and short C⋯O contacts [2.879 (3) Å]. Unsymmetrical halogen-halogen inter-actions between the Cl and F atoms [Cl⋯F = 3.049 (3) Å, C-Cl⋯F = 148.10 (9)° and C-F⋯Cl = 162.06 (13)°] are also formed, giving a meandering two-dimensional network along the a 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: crystal structure