Crystal structure of (E)-3-(5-bromo-2-hydroxy­phen­yl)acryl­aldehyde

The title compound, C(9)H(7)BrO(2), displays a trans configuration with respect to the C=C double bond and is essentially planar [maximum deviation from the least-squares plane through all non-H atoms = 0.056 (4) Å]. The vinyl­aldehyde group adopts an extended conformation wih a C—C—C—C torsion angle of 179.7 (4)°. In the crystal, mol­ecules are linked by classical O—H⋯O and weak C—H⋯O hydrogen bonds into a three-dimensional supra­molecular network.