Crystal structure of 2-amino-4,6-dimethoxypyrimidinium thiophene-2-carboxylate

Abstract

In the title salt, C6H10N3O2+·C5H3O2S−, the 2-amino-4,6-dimethoxypyrimidinium cation interacts with the carboxylate group of the thiophene-2-carboxylate anion through a pair of N—H...O hydrogen bonds, forming an R22(8) ring motif. These motifs are centrosymmetrically paired via N—H...O hydrogen bonds, forming a complementary DDAA array. The separate DDAA arrays are linked by π–π stacking interactions between the pyrimidine rings, as well as by a number of weak C—H...O and N—H...O interactions. In the anion, the dihedral angle between the ring plane and the CO2 group is 11.60 (3)°. In the cation, the C atoms of methoxy groups deviate from the ring plane by 0.433 (10) Å.

Keywords

• crystal structure
• crystal salts
• hydrogen-bonding patterns
• π–π stacking interactions