4-(3-Fluoroanilino)thieno[2,3-b]pyridine-6-carboxylic acid

Abstract

In the title compound, C14H9FN2O2S, the thieno[2,3-b]pyridine residue is almost planar (r.m.s. deviation = 0.0194 Å), with the carboxylic acid group [dihedral angle = 11.9 (3)°] and the benzene ring [71.1 (4)°] being twisted out of this plane to different extents. An intramolecular N—H...O(carbonyl) hydrogen bond closes an S(6) ring. Supramolecular chains along [01-1] mediated by O—H...N(pyridine) hydrogen bonds feature in the crystal. A three-dimensional architecture is completed by π–π interactions occurring between the benzene ring and the two rings of the thieno[2,3-b]pyridine residue [centroid–centroid distances = 3.6963 (13) and 3.3812 (13) Å]. The F atom is disordered over the two meta sites in a near statistical ratio [0.545 (5):0.455 (5)].