3-Carboxy-5-(pyridinium-4-yl)benzoate: a redetermination

摘要

The title compound, C(13)H(9)NO(4), crystallizes in a zwitterionic form with the pyridine N atom protonated and the carboxyl OH group deprotonated. The benzene and pyridinium rings are inclined with a dihedral angle of 31.42 (14)degrees between them. A previous report of this stucture claims, we believe incorrectly, that neither of the carboxylate groups is deprotonated [Zhang et al. (2010). Acta Cryst. E66, o2928-o2928]. In the crystal, intermolecular O-H...O, N-H...O and weak C-H...O hydrogen-bonding interactions link adjacent molecules into a three-dimensional supramolecular network.

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