RESUMO
In the anion of the title hydrated salt, C2H10N22+·C21H13N3O8S2-·2H2O, the planes of the phenyl rings and the benzene ring of the 5-nitro-2-oxido-benzene-sulfonate group are inclined to one another by 44.42â (11), 56.87â (11) and 77.70â (12)°. In the crystal, the anions are linked to the cations and the water mol-ecules by N-Hâ¯O and O-Hâ¯O hydrogen bonds, forming a three-dimensional network. Furthermore, there are face-to-face π-π stacking inter-actions between the centroids of one phenyl ring and the benzene ring of the 5-nitro-2-oxido-benzene-sulfonate group [centroid-centroid distance = 3.8382â (13)â Å and slippage = 1.841â Å]. A Hirshfeld surface analysis was conducted to verify the contributions of the different inter-molecular inter-actions.