4-Chloro-1H-indole-2,3-dione

Abstract

The title compound, C8H4ClNO2, has two planar molecules in the asymmetric unit, with the non-H atoms showing a mean deviation from planarity of 0.015 and 0.022 Å, respectively. In the crystal, the molecules are linked through N—H...O hydrogen bonds to form infinite chains along [010]. They are further connected through C—H...Cl close contacts with a donor–acceptor distance of 3.682 (5) Å. No π–π interactions are observed in the structure.

4,7-Dichloro-1H-indole-2,3-dione

“…The molecules are further linked through C6-H6Á Á ÁO2 interactions, which are also observed in the monosubstituted 7-chloroisatin (Sun & Cai, 2010). There are C-HÁ Á ÁCl interactions present in the structure of 4-chloroisatin (Juma et al, 2016), though no intermolecular halogen interactions are observed in the title compound.…”