N-(2-Formylphenyl)-4-toluenesulfonamide: a second monoclinic polymorph

Abstract

The title compound, C14H13NO3S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahíaet al.[Acta Cryst.(1999), C55, 2158–2160]. Polymorph (II) crystalllized in the space groupP21/c(Z= 4), whereas the title polymorph (I) occurs in the space groupP21/n(Z= 4). The dihedral angle between the two aromatic rings is 75.9 (1)° in (I) compared to 81.9 (1)° for (II). In both polymorphs, twoS(6) rings are generated by intramolecular N—H...O and C—H...O hydrogen bonds, resulting in similar molecular geometries. However, the two polymorphs differ concerning their crystal packing. In (I), molecules are linked intoC(8) zigzag chains along thebaxis by C—H...O hydrogen bonds, whereas in (II) molecules are linked by C—H...O hydrogen bonds, formingC(7) chains along thebaxis. The title polymorph is further stabilized by intermolecular C—H...π and π–π interactions [centroid–centroid distance = 3.814 (1) Å]. These interactions are not evident in polymorph (II).