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Lanthanide azolecarboxylate compounds: Structure, luminescent properties and applications. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214084] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Zhang K, Qi X, Yuan B. Zwitterionic 4-carboxy-2-(pyridinium-2-yl)-1 H-imidazole-5-carboxylate. IUCRDATA 2016. [DOI: 10.1107/s2414314616016412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
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.
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