Received 1 November 2012
The title compound, C7H8NO2+·NO3-·C7H7NO2, exists in the form of a protonated dimer of two anilinium-3-carboxylate molecules related by an inversion center, and a nitrate anion located on a twofold rotation axis. The bridging H atom occupies, with equal probability, the two sites associated with the carboxyl atoms. In addition to the strong O-HO hydrogen bond, in the crystal, the various units are linked via N-HO and C-HO hydrogen bonds forming a three-dimensional structure.
For applications of aminobenzoic acids, see: Congiu et al. (2005); Swislocka et al. (2005). For related structures and details of their hydrogen-bonding motifs, see: Arora et al. (1973); Bahadur et al. (2007); Hansen et al. (2007); Lai & Marsh (1967); Lu et al. (2001); Smith et al. (1995); Zaidi et al. (2008).
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97, PLATON and publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: KJ2215 ).
The authors are grateful to Government College University Lahore for providing the X-ray diffraction facility, and to Professor Helen Stoeckli-Evans for valuable discussions.
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