2-[(E)-(2,4-Dihydroxybenzylidene)azaniumyl]-3-phenylpropanoate

Abstract

The title compound, C16H15NO4, exists as a zwitterion in the solid state, with the carboxylic acid group being deprotonated and the imine N atom being protonated. The molecule adopts an E configuration about the C=N double bond. The dihedral angle between the benzene rings is 46.34 (4)°. An intramolecular N—H...O hydrogen bond generates an S(6) ring motif. In the crystal, adjacent molecules are connected by intermolecular O—H...O and C—H...O hydrogen bonds, forming supramolecular ribbons along the a axis.