3-Chloro-2,4,5-trifluoro­benzoic acid

The title compound, C₇H₂ClF₃O₂, was prepared by the chlorination of 3-amino-2,4,5-trifluoro­benzoic acid. The carboxyl group is twisted relative to the benzene ring by 6.8 (1)°. In the crystal, pairs of O—H...O hydrogen bonds link mol­ecules into typical centrosymmetric carb­oxy­lic acid dimers. These dimers are arranged into sheets parallel to (-103).

Dimethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate)

In the title compound, C₂₇H₂₂N₂O₄, the two indole ring systems are approximately perpendicular to each other, with a dihedral angle of 84.5 (5)° between their planes; the benzene ring is twisted with respect to the two indole ring systems at angles of 78.5 (5) and 86.5 (3)°. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, weak C—H...O and C—H...N hydrogen bonds, and C—H...π inter­actions into a three-dimensional supra­molecular architecture.