Quinoline-2-sulfonamide

In the title compound, C₉H₈N₂O₂S, the sulfamoyl –NH₂ group is involved in inter­molecular hydrogen bonding with the sulfonamide O and quinoline N atoms. In the crystal, mol­ecules are linked into dimers via pairs of N—H...N hydrogen bonds, forming an R₂²(10) motif. The dimers are further assembled into chains parallel to the b axis through N—H...O hydrogen bonds, generating a C(4) motif. The crystal packing is additionally stabilized by inter­molecular C—H...O inter­actions. The crystal studied was a non-merohedral twin with a domain ratio of 0.938 (2):0.062 (2). Density functional theory (DFT) calculations, at the B3LYP/6–31 G(d,p) level of theory, were used to optimize the mol­ecular structure and to determine inter­action energies for the title compound. The resulting inter­action energy is ∼4.4 kcal mol⁻¹ per bridge for the C(4) chain and ∼5.9 kcal mol⁻¹ per bridge for the R₂²(10) motif.