Zwitterionic 4-carboxy-2-(pyridinium-2-yl)-1H-imidazole-5-carboxylate
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The title compound, C10H7N3O4, is zwitterionic, with one carboxyl group deprotonated and the pyridyl group protonated. The pyridine ring is close to coplanar with the imidazole ring, making a dihedral angle of 2.79 (8)°, this conformation being maintained by the presence of an intramolecular O—H...O hydrogen bond. In the crystal, two sets of N—H...O hydrogen bonds link the molecules through three conjoined cyclic hydrogen-bonding interactions, with two R 1 2(7) and one R 2 2(10) motifs, forming centrosymmetric cyclic dimers. These are linked through C—H...O hydrogen bonds, giving a supramolecular chain structure extending along the b-axis direction.
2007 ◽
Vol 63
(11)
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pp. o4242-o4242
2009 ◽
Vol 65
(6)
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pp. o1246-o1247
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2014 ◽
Vol 70
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pp. o978-o978
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2012 ◽
Vol 68
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pp. o1848-o1849
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2014 ◽
Vol 70
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pp. o577-o578
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2017 ◽
Vol 73
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pp. 813-816
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2007 ◽
Vol 63
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pp. o1455-o1456
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