2-Methyl-3-(4-nitrophenyl)acrylic acid

Abstract

The title compound, C10H9NO4, forms R 2 2(8) dimers due to intermolecular O—H...O hydrogen bonding in the crystal structure. Two dimers are further linked to each other through two intermolecular C—H...O hydrogen bonds, forming an R 3 3(7) ring motif. The nitro groups form an intramolecular C—H...O hydrogen bond mimicking a five-membered ring. As a result of these hydrogen bonds, polymeric sheets are formed. The aromatic ring makes a dihedral angle of 42.84 (8)° with the carboxylate group and an angle of 8.01 (14)° with the nitro group. There is a π-interaction (N—O...π) between the nitro group and the aromatic ring, with a distance of 3.7572 (14) Å between the N atom and the centroid of the aromatic ring.