Acta Cryst. (2012). E68, o2818
[ doi:10.1107/S1600536812037002 ]

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

F. Perdih

Abstract: 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-HO=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-HO hydrogen bond with the trichloroacetate anion. Due to the extended hydrogen bonding, including C-HO and C-HCl interactions, all components in the structure aggregate into a three-dimensional supramolecular framework.

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