Bis[4-(2-nitrobenzenesulfonamido)pyridinium] hexafluorosilicate

In the title compound, 2C(11)H(10)N(3)O(4)S(+)center dot SiF62-, the short C-N distance [1.386 (2) angstrom] is indicative of a slight conjugation of N with the pi electrons of the pyridinium ring, and with those of the sulfonyl group. The dihedral angle between the benzene and pyridinium rings is 77.48 (7)degrees. The crystal structure is stabilized by N-H center dot center dot center dot F and C-H center dot center dot center dot F hydrogen bonds. The Si atom of the anion lies on a special position.