A 1:1 proton transfer compound of 2-aminobenzoic acid with nitric acid

The asymmetric unit of the title compound, 2-carboxy-anilinium nitrate, C7H8NO2 +·NO3 -, consists of a 2-carboxy-anilinium cation protonated at the amino group and a nitrate anion. The carboxyl group of 2-carboxy-anilinium lies in the benzene-ring plane and a characteristic S(6)-type motif forms via an intra-molecular N - H⋯O hydrogen bond between the carbonyl O atom and the amino group. The structure exhibits strong classical O - H⋯O and three-centered N - H⋯O inter-actions. Aggregation of cations and anions through hydrogen bonds form infinite one-dimensional hydrogen-bonded ribbons extending along [10]. © 2007 International Union of Crystallography. All rights reserved.