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Acta Cryst. (2003). E59, o742-o744 [ doi:10.1107/S1600536803009164 ]
Abstract: In the title compound, C5H6N+·C2HO4-·C2H2O4·2H2O, the pyridine molecule exists as a cation and the oxalic acid molecules as an oxalate(1-) ion and a neutral oxalic acid. The structure is stabilized by O-H
O and N-HO hydrogen bonds in addition to carbonyl-carbonyl OC short contacts and van der Waals interactions. The water molecules are also found to mediate interactions between oxalate ions and oxalic acid molecules through a number of O-HO hydrogen bonds. Pairs of pyridinium cations related by a center of inversion are surrounded by semi-oxalate anions and oxalic acid molecules, and the complex may be described as an inclusion compound.
Online 9 May 2003
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