2-(7-Methyl-1H-indol-3-yl)acetonitrile

2-(4-Chloro-1H-indol-3-yl)acetonitrile

The title compound, C(10)H(7)ClN(2), contains two approximately planar mol-ecules, A and B (r.m.s. deviations = 0.039 and 0.064 Å, respectively) in the asymmetric unit. In the crystal, N-H⋯N hydrogen bonds link the mol-ecules into C(7) chains of alternating A and B mol-ecules propagating along the a-axis direction. The crystal used for the data collection was found to be a racemic twin.

2-(4-Methoxy-1H-indol-3-yl)acetonitrile

In the title compound, C₁₁H₁₀N₂O, the cyanide group is twisted away from the indole-ring plane [C_cy—C_me—C_ar—C_ar = 70.7 (2)°; cy = cyanide, me = methyl­ene, ar = aromatic], whereas the meth­oxy C atom is almost coplanar with the ring system [displacement = 0.014 (5) Å]. In the crystal, N—H⋯N hydrogen bonds link the mol­ecules into C(7) chains propagating in [100].

2-(6-Chloro-1H-indol-3-yl)acetonitrile

In the title compound, C₁₀H₇ClN₂, the carbonitrile group is twisted away from the plane of the indole ring system [C_cy—C_me—C_ar—C_ar = −44.7 (8)°; cy = cyanide, me = methyl­ene and ar = aromatic]. In the crystal, N—H⋯N hydrogen bonds link the mol­ecules into C(7) chains propagating in [010]. Aromatic π–π stacking inter­actions [minimum centroid–centroid separation = 3.663 (3) Å] are also observed.