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

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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 (8) and R (10) hydrogen-bonded rings, respectively, around the inversion centres. In (II) and (III), the cations and anions are linked by N—H…O and O—H…O 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).

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270104019201

Publication date: October 1, 2004

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