Acta Cryst. (2012). E68, o2733 [ doi:10.1107/S1600536812035507 ]
Abstract: 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-HO 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-HO hydrogen bonding of the adjacent amide groups of 4-carbamoylpyridin-1-ium ions. Weak C-HO interactions also occur.
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