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 R 2 2(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.
Highlights
ISSN 2056-9890 arrays have been observed in trimethoprim hydrogen glutarate (Robert et al, 2001), trimethoprim formate (Umadevi et al, 2002), trimethoprim-m-chlorobenzoate (Raj et al, 2003), pyrimethaminium 3,5-dinitrobenzoate (Subashini et al, 2007) and 2-amino-4,6-dimethoxypyrimidinum-salicylate (Thanigaimani et al, 2007)
C6H10N3O2+ÁC5H3O2SÀ, the 2-amino-4,6dimethoxypyrimidinium cation interacts with the carboxylate group of the thiophene-2-carboxylate anion through a pair of N—HÁ Á ÁO hydrogen bonds, forming an R22(8) ring motif
These motifs are centrosymmetrically paired via N—HÁ Á ÁO hydrogen bonds, forming a complementary DDAA array
Summary
ISSN 2056-9890 arrays have been observed in trimethoprim hydrogen glutarate (Robert et al, 2001), trimethoprim formate (Umadevi et al, 2002), trimethoprim-m-chlorobenzoate (Raj et al, 2003), pyrimethaminium 3,5-dinitrobenzoate (Subashini et al, 2007) and 2-amino-4,6-dimethoxypyrimidinum-salicylate (Thanigaimani et al, 2007). C6H10N3O2+ÁC5H3O2SÀ, the 2-amino-4,6dimethoxypyrimidinium cation interacts with the carboxylate group of the thiophene-2-carboxylate anion through a pair of N—HÁ Á ÁO hydrogen bonds, forming an R22(8) ring motif. These motifs are centrosymmetrically paired via N—HÁ Á ÁO hydrogen bonds, forming a complementary DDAA array. The separate DDAA arrays are linked by – stacking interactions between the pyrimidine rings, as well as by a number of weak C—HÁ Á ÁO and N—HÁ Á ÁO interactions.
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