2-Bromo-3-nitrobenzaldehyde

The title compound, C7H4BrNO3, was isolated as a by-product while attempting to prepare a diselenide. There is a close intra­molecular Br⋯O contact [2.984 (2) Å]. The mol­ecules form loosely associated dimers held together by weak inter­molecular Br⋯O inter­actions with the nitro O atoms [Br⋯O = 3.179 (3) Å]. As a result of these inter­actions, there is also a close Br⋯Br inter­molecular contact [3.8714 (6) Å]. In addition, there are weak inter­molecular C—H⋯O inter­actions. The combination of these inter­actions produces sheets which propagate in the (210) and (\overline{2}10) directions perpendicular to c.