2-Amino-4-meth--oxy-6-methyl-pyrimidinium hydrogen phthalate

摘要

In the hydrogen phthalate anion of the title mol-ecular salt, C6H10N3O+·C8H5O4?, the dihedral angles formed by the benzene ring and the mean planes of the –COOH and –COO??groups are 16.1?(3) and 19.8?(3)°, respectively. There is an intra-molecular O—H?O hydrogen bond in the anion generating an?S(7) ring motif. In the crystal, the protonated N atom of the pyrimidinium ring and the 2-amino group of the cation are hydrogen bonded to the carboxyl-ate O atoms of the anion?via?a pair of N—H?O hydrogen bonds, forming an?R22(8) ring motif. The ion pairs are further connected?via?N—H?O and C—H?O hydrogen bonds, forming ribbons parallel to the [01-1] direction. The ribbons are linked by off-set?π–π?stacking inter-actions [inter-centroid distances = 3.8279?(16) and 3.6074?(15)??], forming a three-dimensional structure.