9-(4-Nitrophenyl-sulfonyl)-9H-carbazole

In the title molecule, C₁₈H₁₂N₂O ₄S, the carbazole skeleton is nearly planar [maximum deviation = 0.037 (1) Å] and is oriented at a dihedral angle of 73.73 (5)° with respect to the benzene ring. An intra-molecular C-H⋯O hydrogen bond links a nitro O atom to the carbazole skeleton. In the crystal, intermolecular C-H⋯O hydrogen bonds link the molecules into a three-dimensional network. π-π contacts between inversion-related benzene rings [centroid-centroid distance = 3.7828 (8) Å] and two weak C-H⋯π inter-actions may also stabilize the structure.