Crystal structures of 1-benzene-sulfon-yl-2-methyl-3-(4-nitro-benzoyl)-2,3-di-hydro-1-indole and 1-benzene-sulfon-yl-2-methyl-3-[(thio-phen-2-yl)carbon-yl]-2,3-di-hydro-1-indole.

In the title indole derivatives, CHNOS, (I) and CHNOS, (II), the sulfonyl-bound phenyl rings are almost orthogonal to the indole ring system, subtending dihedral angles of 88.33 (10) and 87.58 (16)°, respectively. In both compounds, the sulfonyl S atom has a distorted tetra-hedral geometry [O-S-O = 119.98 (9) and N-S-C = 104.01 (8)° for compound (I) and O-S-O = 120.08 (18) and N-S-C = 104.91 (14)° for compound (II)] and the sum of the bond angles at N indicates hybridization. The mol-ecules of both (I) and (II) feature intra-molecular C-H⋯O hydrogen bonds that generate (6) ring motifs with the sulfone O atom. In the crystals, mol-ecules of (I) are linked by C-H-O hydrogen bonds, forming (18) ring motifs while mol-ecules of (II) are linked by C-H-O and C-H-S hydrogen bonds, forming (12) ring motifs. Compound (II) was refined as an inversion twin.