2-(4-Chloro-2-nitro-phen-yl)-9-phenyl-sulfonyl-9H-carbazole-3-carbaldehyde

In the title compound, C25H15ClN2O6S, the carbazole ring system is essentially planar, with a maximum deviation of 0.152 (3) Å for the C atom to which the 4-chloro-2-nitro-phenyl ring is attached. Its mean plane is almost orthogonal to the phenyl-sulfonyl and nitro-phenyl rings, making dihedral angles of 82.64 (14) and 79.89 (13)°, respectively. The N atom of the nitro group deviates by 0.032 (3) Å from the benzene ring to which it is attached. The mol-ecular structure features intra-molecular O-H⋯O and C-H⋯O hydrogen bonds, which generate three S(6) ring motifs. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, which generate C(6) and C(9) chains running in the [100] and [010] directions, respectively, forming a two-dimensional network lying parallel to (001). There are also R 4 (3)(28) supra-molecular graph-set ring motifs enclosed within these networks.