7-Bromo-1H-indole-2,3-dione

Abstract

The title compound, C8H4BrNO2, has a single planar molecule in the asymmetric unit with the non-H atoms possessing a mean deviation from planarity of 0.034 Å. The molecules dimerize in the solid state through N—H...O hydrogen bonds. These dimers are further linked by intermolecular Br...O close contacts of 3.085 (2) Å to yield infinite chains along [20-1]. The nine-membered rings of the isatins stack along theaaxis, with parallel slipped π–π interactions [intercentroid distance = 3.8320 (7) Å, interplanar distance = 3.341 (2) Å and slippage = 1.876 (4) Å].