2{[3-(Trifluoromethyl)phenyl]amino}-3-pyridinecarboxylic acid (niflumic acid)

Abstract

C₁₃H₉F₃N₂O₂, P2₁/n, a= 5.111(2), b = 15.330 (2), c = 15.479 (2) Å, β = 95.5 (3) °, D_m = 1.51 (flotation), D_c = 1. 55 Mg M^-3, Z = 4. The three planar groupings in the molecule, i.e., the two six-membered ring and the carboxyl group, are nearly coplanar. In the crystal structure the molecules exist as hydeogen-bonded dimers. In addition, there is an intra-molecular hydrogen bond connecting the carboxyl group and the N atom which bridges the two six-membered rings.