6-Bromo-4-oxo-4H-chromene-3-carbaldehyde

In the title compound, C 10 H 5 BrO 3 , a brominated 3-formylchromone derivative, the non-H atoms are essentially coplanar (r.m.s. deviation = 0.0420 Å), with the largest deviation from its mean plane [0.109 (2) Å] being found for the ring-bound carbonyl O atom. In the crystal, molecules are linked through halogen bonds [Br...O = 3.191 (2) Å, C—Br...O = 167.32 (10)° and C=O...Br = 168.4 (2)°] along [101]. Molecules are assembled into layers parallel to (101) via π–π stacking interactions along the b axis [shortest centroid–centroid distance between the pyran and benzene rings = 3.495 (2) Å].

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