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In the title mol-ecular salt, C 9 H 10 N 5  + ·C 7 H 7 O 3 S - , the asymmetric unit consists of a 2,4-di-amino-6-phenyl-1,3,5-triazin-1-ium cation and a 4-methyl-benzene-sulfonate anion. The cation is protonated at the N atom lying between the amine and phenyl substituents. The protonated N and amino-group N atoms are involved in hydrogen bonding with the sulfonate O atoms through a pair of inter-molecular N-H⋯O hydrogen bonds, giving rise to a hydrogen-bonded cyclic motif with R  2  2 (8) graph-set notation. The inversion-related mol-ecules are further linked by four N-H⋯O inter-molecular inter-actions to produce a complementary DDAA ( D = donor, A = acceptor) hydrogen-bonded array, forming R  2  2 (8), R  4  2 (8) and R  2  2 (8) ring motifs. The centrosymmetrically paired cations form R  2  2 (8) ring motifs through base-pairing via N-H⋯N hydrogen bonds. In addition, another R  3  3 (10) motif is formed between centrosymetrically paired cations and a sulfonate anion via N-H⋯O hydrogen bonds. The crystal structure also features weak S=O⋯π and π-π inter-actions. Hirshfeld surface and fingerprint plots were employed in order to further study the inter-molecular inter-actions.

Crystal structure and Hirshfeld surface analysis of 2,4-diamino-6-phenyl-1,3,5-triazin-1-ium 4-methylbenzenesulfonate