Synthesis and structure of <i>N</i> -(perfluorophenyl)isonicotinamide

The title compound [systematic name: <i>N</i>-(2,3,4,5,6-penta-fluoro-phen-yl)pyridine-4-carboxamide], C₁₂H₅F₅N₂O, crystallizes with two independent mol-ecules (<i>A</i> and <i>B</i>) in the asymmetric unit in space group <i>P</i>1. The mol-ecules adopt a conformation where the planes of the penta-fluoro-phenyl and pyridyl rings have twist angles of 5.3 (1) and 14.5 (1)°. In the crystal, the mol-ecules are connected by N-H⋯N hydrogen bonds between the amide H atom and the pyridyl nitro-gen atom of an adjacent mol-ecule to generate [110] chains of alternating <i>A</i> and <i>B</i> mol-ecules. The packing is consolidated by C-H⋯π inter-actions, π-π stacking and C-H⋯O inter-actions and a short F⋯F contact of 2.7270 (13) Å occurs. The structures of related isonicotinamides are surveyed.