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

Authors
Journal
Acta Crystallographica Section E Structure Reports Online
1600-5368
Publisher
International Union of Crystallography
Publication Date
Volume
67
Issue
6
Identifiers
DOI: 10.1107/s1600536811016394
Keywords
  • Organic Papers

Abstract

The title compound, C13H9NO4, 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)° 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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