4-Carbamoylpyridin-1-ium 2,2,2-trichloro­acetate

In the asymmetric unit of the title salt, C₆H₇N₂O⁺·C₂Cl₃O₂⁻, there are two crystallographic independent ion pairs. The amide groups of the 4-carbamoylpyridin-1-ium ions are slightly twisted out of the plane of the aromatic ring with C—C—C—N torsion angles of 8.8 (9)° and 4.6 (8)°. In the crystal, the 4-carbamoylpyridin-1-ium ion is N—H...O hydrogen bonded to the trichloro­acetate ion via the pyridinium unit and amide group. Layers parallel to the ac plane are formed due to the N—H...O hydrogen bonding of the adjacent amide groups of 4-carbamoylpyridin-1-ium ions. Weak C—H...O inter­actions also occur.

4-Carbamoylpyridin-1-ium 2,2,2-tri­chloro­acetate–isonicotinamide (1/1)

In the crystal structure of the title 1:1 co-crystal, C₆H₇N₂O⁺·C₂Cl₃O₂⁻·C₆H₆N₂O, the amide groups of the 4-carbamoylpyridin-1-ium ion and the isonicotinamide mol­ecule are twisted out of the plane of the aromatic ring with C—C—C—N torsion angles of 21.5 (4) and −33.5 (4)°, respectively. The 4-carbamoylpyridin-1-ium and isonicotinamide amide groups form R₂²(8) hydrogen-bonded dimers via N—H...O=C inter­actions. The two remaining amide H atoms (i) link dimers via the cation to an isonicotinamide and (ii) from the isonicotinamide to a trichloro­acetate anion. The pyridinium H atom also forms an N—H...O hydrogen bond with the trichloro­acetate anion. Due to the extended hydrogen bonding, including C—H...O and C—H...Cl interactions, all components in the structure aggregate into a three-dimensional supra­molecular framework.