Acta Cryst. (2012). E68, o3444-o3445 [ doi:10.1107/S1600536812047642 ]
Abstract: In the 4-methoxyquinoline-2-carboxylate anion of the title salt, C5H8N3+·C11H8NO3-, the dihedral angle between the quinoline ring system and the carboxylate group is 16.54 (15)°. In the crystal, the cations and anions are linked via N-HO and N-HN hydrogen bonds, forming a centrosymmetric 2 + 2 aggregate with R22(9) and R42(8) ring motifs. These units are further connected via N-HO hydrogen bonds into a layer parallel to the bc plane. The crystal structure is also stabilized by weak C-HO hydrogen bonds and - interactions between pyridine rings [centroid-centroid distance = 3.5886 (8) Å] and between pyridine and benzene rings [centroid-centroid distance = 3.6328 (8) Å].
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