The title compound, C11H10N2O2S, crystallizes as a zwitter-ionic tautomer, N-(4- pyridinio) benzenesulfonamidate, with the pyridine N atom protonated and the amide N atom deprotonated. There is evidence for conjugation between the anionic N atom and the pyridinium ring. In the crystal structure, intermolecular N-H center dot center dot center dot N hydrogen bonds link the molecules into chains along the c axis. Weak C-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions further stabilize the structure.
基金：
Financial support by the Science Project of the Hebei
Education Department (grant No. 2005350) and the Natural
Science Foundation of Hebei Province (grant No.
B2007000156) is gratefully acknowledged.
