Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Chemistry and Pharmacology
The crystal structure of the title compound, C5H7N2+·C12H10NO4S2−, consists of two independent cation–anion pairs, A and B. Within each pair, the H—N—C—N*—H grouping (N*—H is the pyridinium function) and one N—S—O moiety of the anion are linked by N*—H...N and N—H...O hydrogen bonds to form an antidromic ring motif of type R22(8). The remaining amino donors give rise to N—H...O hydrogen bonds, connecting the ion pairs into A–B–A–B– chains. The structure testifies to the persistence of the R22(8) motif in question, which was previously detected as a highly robust supramolecular synthon in a series of onium di(methanesulfonyl)amidates. The structure is pseudosymmetric; the anion positions correspond to space group P21/n, but those of the cations do not.
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