5-Amino-1-phenyl-1H-pyrazole-4-carboxylic acid

Abstract

In the molecule of the title compound, C10H9N3O2, the pyrazole ring is approximately coplanar with the amino and carboxyl groups. The phenyl group is twisted by 48.13 (3)° relative to this plane. An intramolecular N—H...O hydrogen bond stabilizes the planar conformation of the molecule. The molecules are linked into two-dimensional sheets by two strong intermolecular N—H...N and O—H...O hydrogen bonds. The latter forms the classic carboxylic acid dimer motif.