Crystal structure of 3-bromo-2-hydroxybenzoic acid

Abstract

Mutual carboxyl–carboxyl O—H...O hydrogen bonds link the molecules of the title compound, C7H5BrO3, into centrosymmetric dimers which display a central R22(8) ring motif. In addition, there is an intramolecular hydroxyl–carboxyl O—H...O interaction present. A comparison with the crystal structures of 59 other substituted derivatives of salicylic acid shows that both the centrosymmetric carboxyl–carboxyl O—H...O dimer and the stacking mode of molecules along the short a axis observed in the title structure are frequent packing motifs in this set.

Keywords

• crystal structure
• hydrogen bonding
• structural systematics
• XPac
• salicylic acid derivative