The 1:1 proton-transfer compound of 8-quinolinol (oxine) with pyrazine-2,3-dicarboxylic acid: 8-hydroxyquinolinium 3-carboxypyrazine-2-carboxylate dihydrate
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The asymmetric unit of the title compound, C9H8NO+烶H3N2O4-粈2O, contains two independent cations, two anions and four water molecules of solvation. A three-dimensional framework structure is formed through extensive hydrogen-bonding involving most donor and acceptor species. Significant aromatic C-H...O and cation-cation [pi]-[pi] interactions are also present.
Acta crystallographica. Section E, Structure reports online
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