%0 Journal Article %T 2-(Benzenesulfonamido)pyridinium perchlorate %A Xun Li %A Dan Xie %A Zhi-Hong Xiao %A Chang-Zhu Li %J Acta Crystallographica Section E %D 2009 %I International Union of Crystallography %R 10.1107/s1600536809019205 %X In the title compound, C11H11N2O2S+¡¤ClO4 , the dihedral angle between the benzene and pyridinium rings is 87.33 (10)¡ã. An intramolecular N¡ªH...O interaction, with an S=O-bonded O atom as receptor, occurs in the cation. In the crystal structure, ion pairs occur, being linked by strong N¡ªH...O hydrogen bonds. The perchlorate anion plays a further role in the molecular packing by accepting several weak C¡ªH...O interactions. %U http://scripts.iucr.org/cgi-bin/paper?S1600536809019205