4-Chloro­anilinium 2-carb­oxy-4,5-dichloro­benzoate

摘要

The structure of the 1:1 proton-transfer compound of 4-chloro­aniline with 4,5-dichloro­phthalic acid (DCPA), viz. C6H7ClN+·C8H3Cl2O4 −, has been determined at 130 K. The non-planar hydrogen phthalate anions and the 4-chloro­anilinium cations form two-dimensional O—H⋯O and N—H⋯O hydrogen-bonded substructures which have no peripheral extension. Between the sheets there are weak π–π associations between alternating cation–anion aromatic ring systems [shortest centroid–centroid separation = 3.735 (4) Å].