Nirmalram, Jeyaraman Selvaraj published the artcileHydrogen-bonding patterns in pyrimethaminium pyridine-3-sulfonate, Recommanded Product: Pyridine-3-sulfonic acid, the publication is Acta Crystallographica, Section E: Structure Reports Online (2010), 66(8), o2121-o2122, database is CAplus and MEDLINE.
In the asym. unit of the title salt [systematic name: 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium pyridine-3-sulfonate], C12H14N4Cl+·C5H4NSO3–, there are two independent pyrimethaminium cations and two 3-pyridine sulfonate anions. Each sulfonate group interacts with the corresponding protonated pyrimidine ring through two N-H…O hydrogen bonds, forming a cyclic hydrogen-bonded bimol. R22(8) motif. Even though the primary mode of association is the same, the next higher level of supramol. architectures are different due to different hydrogen-bonded networks. In one of the independent mols. in the asym. unit, the pyrimethamine cation is paired centrosym. through N-H…N hydrogen bonds, generating an R22(8) ring motif. In the other mol., the pyrimethamine cation does not form any base pairs; instead it forms hydrogen bonds with the 3-pyridine sulfonate anion. The structure is further stabilized by C-H…O, C-H…N and π-π stacking [centroid-centroid distance = 3.9465 (13) Å] interactions. Crystallog. data are given.
Acta Crystallographica, Section E: Structure Reports Online published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Recommanded Product: Pyridine-3-sulfonic acid.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem