Self-assembled supramolecular sheet- and channel-type frameworks in the p-phenetidinium hydrogen phthalate and cyclohexylaminium hydrogen phthalate hemihydrate salts

The title compounds, p-phenetidinium hydrogen phthalate (or 4-ethoxyanilinium 2-carboxybenzoate), C₈H₁₂NO⁺·C₈H₅O₄⁻, (I), and cyclohexylaminium hydrogen phthalate hemihydrate (or cyclohexylaminium 2-carboxybenzoate hemihydrate), C₆H₁₄N⁺·C₈H₅O₄⁻·0.5H₂O, (II), form two- and one-dimensional supramolecular networks, respectively. In (I), the anionic–cationic network consists of R₃²(6) and R₄⁴(16) hydrogen-bonded rings forming a two-dimensional sheet along the (001) plane. In (II), O—H...O hydrogen bonds connect the glide-related anions, generating a supramolecular chain running parallel to [001] to which the cations are linked to form one-dimensional channels along [001]. The solvent water molecules, which reside on twofold axes, are trapped inside the molecular channels by N—H...O and O—H...O hydrogen bonds.