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In the title molecule, C18H12N2O4S, 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 intramolecular 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 interactions may also stabilize the structure.