Methyl (2Z)-2-[(2-formyl-3-methyl-1H-indol-1-yl)meth­yl]-3-(4-meth­oxy­phen­yl)prop-2-enoate

In the title indole derivative, C₂₂H₂₁NO₄, the dihedral angle between the benzene and pyrrole rings of indole moiety is 1.8 (1)°. The plane of the 4-meth­oxy­phenyl ring is oriented with a dihedral angle of 60.7 (1)° with respect to the plane of the indole moiety. The mol­ecular packing is stabilized by C—H...O hydrogen bonds which form a V-shaped chain arrangement along the bc plane of the unit cell. In addition to this, C—H...π and π–π inter­actions [centroid–centroid distances = 3.8102 (11) and 3.8803(12) Å], which run along the b-axis direction, stabilize the mol­ecular packing.

Crystal structure of 9-butyl-3-(9-butyl-9H-carbazol-3-yl)-9H-carbazole

In the title carbazole derivative, C₃₂H₃₂N₂, the mol­ecule resides on a crystallographic twofold axis, which runs through the central C—C bond. The carbazole ring system is almost planar, with a maximum deviation of 0.041 (1) Å for one of the ring-junction C atoms. The crystal packing is stabilized by C—H...π inter­actions only, which form a C(7) chain-like arrangement along [110] in the unit cell.

Crystal structure of 4-amino-1-(4-methyl­benz­yl)pyridinium bromide

The title mol­ecular salt, C₁₃H₁₅N₂⁺·Br⁻, crystallized with two independent ion pairs (A and B) in the asymmetric unit. In the cations, the planes of the pyridine and benzene rings are inclined to one another by 79.32 (8) and 82.30 (10)° in ion pairs A and B, respectively. In the crystal, the anions and cations are connected by N—H...Br hydrogen bonds, forming a centrosymmetric tetra­mer-like unit enclosing an R₈⁴(16) ring motif. These units are linked via C—H...Br hydrogen bonds, forming a three-dimensional network.