(5-Meth­oxy-1H-indol-3-yl)acetonitrile

In the title compound, C₁₁H₁₀N₂O, the O atom and the C atom of the methyl­ene group deviate only slightly [0.029 (3) and 0.055 (3) Å, respectively] from the approximately planar ring system (r.m.s. deviation = 0.013 Å). In the crystal, N—H...O hydrogen bonds link the mol­ecules into zigzag chains running along the b axis.

6-[(E)-2-Phenyl­vin­yl]-1H-indole

The title compound, C₁₆H₁₃N, is essentially planar [maximum deviation from the least-squares plane = 0.081 (3) Å], with a dihedral angle of 1.65 (13)° between the planes of the indole and benzene rings. In the crystal, there are no significant inter­molecular π–π inter­actions [minimum ring centroid–centroid separation = 4.217 (5) Å].

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

In the title compound, C₁₁H₁₀N₂, the carbonitrile group is twisted away from the indole plane [C_cy—C_me—C_ar—C_ar = 66.6 (2)°; cy = cyanide, me = methyl­ene and ar = aromatic]. In the crystal, N—H...N hydrogen bonds link the mol­ecules into C(7) chains propagating in the [001] direction.

3-[(E)-2-Phenyl­ethen­yl]-1H-indole-6-carbonitrile

In the title compound, C₁₇H₁₂N₂, the inter­planar angle between the indole mean plane [max.deviation 0.030 (1) Å] and the phenyl ring is 24.32 (7)°. In the crystal, inter­molecular N—H...N[triple bond]C hydrogen bonds form zigzag chains in the a-axis direction augmented by weak C—H...N[triple bond]C contacts.