| Summary: | In the title salt, C6H9N2+·C4H3O4−, the dihedral angle between the pyridine ring and the plane formed by the hydrogen fumarate anion is 85.67 (6)°. Excluding the amino and methyl groups, the atoms of the cation are coplanar, with a maximum deviation of 0.005 (1) Å. In the crystal structure, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N—H...O hydrogen bonds, forming an R22(8) ring motif. These motifs are further connected through N—H...O and C—H...O hydrogen bonds, leading to a supramolecular chain along the c axis. These chains are further cross-linked via a pair of O—H...O hydrogen bonds involving centrosymmetrically related hydrogen fumarate anions, forming a two-dimensional network parallel to (101). These planes are further interconnected by O—H...O interactions into a three-dimensional network.
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