2-Amino-3-methylpyridinium hydrogen phthalate

Abstract

In the title molecular salt, C6H9N2+·C8H5O4−, the cation is protonated at the pyridine N atom and the anion is deprotonated at the hydroxy O atom. The anion features an intramolecular O—H...O hydrogen bond with the H atom located almost in the middle of the two O atoms. The dihedral angle between the pyridine and benzene rings is 19.17 (12)°. The N—H...O hydrogen bonds generate R22(8) and R24(18) ring motifs. The crystal structure is stabilized by N—H...O hydrogen bonds. The structure is also influenced by weak π–π [centroid-to-centroid distance = 3.7347 (14) Å] interaction between the anions.

Keywords

• crystal structure
• molecular salt
• hydrogen bonding