Crystal structure of dimethyl 3,3'-[(4-chlorophenyl)methylene]bis(1H-indole-2-carboxylate)

In the title compound, C₂₇H₂₁ClN₂O₄, the mean planes of the two indole ring systems (r.m.s. deviations = 0.021 and 0.024Å) are approximately perpendicular to one another, with a dihedral angle of 79.54(12)°. The benzene ring is twisted with respect to the mean planes of the two indole ring systems at angles of 80.14(15) and 86.30(15)°. In the crystal, molecules are linked by N-H⋯O hydrogen bonds, forming inversion dimers with an R² 2(18) ring motif. The dimers are linked by a further N-H⋯O hydrogen bond, forming chains along [100]. There are intra- and intermolecular C-H⋯π interactions present, the latter linking the chains to form a three-dimensional supramolecular structure.