Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 10 (October 2004)

organic compounds

Acta Cryst. (2004). C60, o718-o722 [ doi:10.1107/S0108270104019201 ]

2-Pyridone-tartronic acid (1/1), 3-hydroxypyridinium hydrogen tartronate and 4-hydroxypyridinium hydrogen tartronate

T. Fukunaga, S. Kashino and H. Ishida

Abstract: Tartronic acid forms a hydrogen-bonded complex, C₅H₅NO·C₃H₄O₅, (I), with 2-pyridone, while it forms acid salts, namely 3-hydroxypyridinium hydrogen tartronate, (II), and 4-hydroxypyridinium hydrogen tartronate, (III), both C₅H₆NO⁺·C₃H₃O₅^-, with 3-hydroxypyridine and 4-hydroxypyridine, respectively. In (I), the pyridone molecules and the acid molecules form R ${_2^2}$ (8) and R ${_2^2}$ (10) hydrogen-bonded rings, respectively, around the inversion centres. In (II) and (III), the cations and anions are linked by N-HO and O-HO hydrogen bonds to form a hydrogen-bonded chain. In each of (I), (II) and (III), an intermolecular hydrogen bond is formed between a carboxyl group and the hydroxyl group attached to the central C atom, and in (I), the hydroxyl group participates in an intramolecular hydrogen bond with a carbonyl group. No intermolecular hydrogen bond is formed between the carboxyl groups in (I), or between the carboxyl and carboxylate groups in (II) and (III).

Formula: C₅H₅NO·C₃H₄O₅ and two isomers of C₅H₆NO⁺·C₃H₃O₅^-


	Structure factor file (CIF format) (135.1 kbytes) Contains datablock I

	Structure factor file (CIF format) (78.5 kbytes) Contains datablock II

	Structure factor file (CIF format) (67.5 kbytes) Contains datablock III

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