Acta Cryst. (2006). E62, o2707-o2709  [ doi:10.1107/S1600536806020071 ]

Monoclinic polymorph of the 1:1 adduct of sulfathiazole with pyridine

T. N. Drebushchak, M. A. Mikhailenko, E. V. Boldyreva and T. P. Shakhtshneider

Abstract: The asymmetric unit of the title compound, C₉H₉N₃O₂S₂·C₅H₅N, contains a sulfathiazole and a pyridine molecule linked via N-HN hydrogen bonds, as in the tetragonal polymorph. The monoclinic polymorph is unstable in air at ambient conditions and loses pyridine giving sulfathiazole. The monoclinic polymorph belongs to the class of disappearing polymorphs; it was the first polymorph to be obtained, but could not be obtained again, after the tetragonal polymorph was crystallized.

Online 14 June 2006

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