3,5-Dicarboxy-2,6-dimethyl-4-(3-nitrophenyl)pyridinium Nitrate Monohydrate

Energy-minimization studies of the title compound, C₁₅H₁₃N₂O₆⁺.NO₃^-.H₂O, suggest that the stable conformation of the molecule should be that with the carboxyl groups coplanar with the pyridine ring. Isolated in the solid as a pyridinium nitrate monohydrate, the significant rotation of these carboxyl groups from coplanarity with the aromatic ring may be attributed to networks of hydrogen bonding.

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