Abstract
The title tetragonal polymorph is one of the two sulfathiazole–pyridine adducts, C9H9N3O2S2·C5H5N, that can be formed either by crystallization from an n-propanol–pyridine solution, or by exposure of solid sulfathiazole to pyridine vapour. The asymmetric unit consists of a hydrogen-bonded sulfathiazole–pyridine pair. Hydrogen bonds of the form Naniline—H...Osulfonyl form a three-dimensional network. Pyridine molecules linked to sulfathiazole molecules by Namino—H...Npyridine hydrogen bonds are located in the channels of the sulfathiazole framework which extend along the 41 axis. The angle between neighbouring pyridine rings in the channels is 55.2 (3)°. The adduct is stable in pyridine vapour, but decomposes in air under ambient conditions, giving the metastable polymorph I of sulfathiazole [Kruger & Gafner (1972). Acta Cryst. B28, 272–283].
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