In the title compound, C(17)H(14)N(2)O, the dihedral angle between the indole ring system and the benzene ring is 58.41 (4)°. The crystal packing features π-π stacking [shortest centroid-centroid separation = 3.8040 (9) Å] and C-H⋯π inter-actions.

The title indole derivative, C(17)H(15)NO(3)S, crystallizes with two independent mol-ecules in the asymmetric unit. The benzene ring of the tosyl group is almost perpedicular to the indole ring in both mol-ecules, with inter-planar angles of 82.60 (5)° and 81.82 (6)°. The two mol-ecules are, as a consequence, able to form an almost centrosymmetric non-bonded dimer, in which the molecules are li...

In the title compound, C(16)H(14)ClNO(2)S, the phenyl ring makes a dihedral angle of 78.1 (1)° with the indole ring system. The mol-ecular structure is stabilized by weak intra-molecular C-H⋯O inter-actions. The crystal structure exhibits weak inter-molecular C-H⋯O, C-H⋯π and π-π [centroid-centroid distances = 3.620 (1)-3.794 (1) Å] inter-actions.

In the title compound, C(16)H(11)BrN(2), the dihedral angle between the indole ring system and the phenyl ring is 58.85 (11)°.

Apart from the methyl group of the meth-oxy fragment, the title compound, C(15)H(12)N(2)O, is almost planar (r.m.s. deviation = 0.045 Å); the C atom deviates from the mean plane by 1.216 (1) Å. In the crystal, π-π stacking [shortest centroid-centroid separation = 3.4652 (10) Å] and C-H⋯π inter-actions occur.

In the title compound, C(25)H(23)N, the indole unit makes a dihedral angles of 79.03 (5) and 61.82 (4)° with the benzene rings. No classical hydrogen bonds are found in the crystal structure.

There are two crystallographically independent mol-ecules in the asymmetric unit of the title compound, C(23)H(21)NO(3)S. The indole ring system is approximately perpendicular to the sulfonyl phenyl ring in both mol-ecules [dihedral angles = 85.42 (8) and 88.30 (9)°]. C-H⋯O inter-actions between mol-ecules stabilize the crystal structure.