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

The title compound, C(14)H(13)NO(3)S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahía et al. [Acta Cryst. (1999), C55, 2158–2160]. Polymorph (II) crystalllized in the space group P2(1)/c (Z = 4), whereas the title polymorph (I) occurs in the space group P2(1)/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, two S(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 into C(8) zigzag chains along the b axis by C—H⋯O hydrogen bonds, whereas in (II) mol­ecules are linked by C—H⋯O hydrogen bonds, forming C(7) chains along the b axis. 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).