Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 2 (February 2013)

organic compounds

Acta Cryst. (2013). E69, o234    [ doi:10.1107/S1600536813000779 ]

4-Amino-N-(4,6-dimethyl­pyrimidin-2-yl)benzene­sulfonamide-2-nitro­benzoic acid (1/1)

G. Smith and U. D. Wermuth

Abstract: In the asymmetric unit of the title co-crystal, C12H14N4O2S·C7H5NO4, the sulfamethazine and 2-nitro­benzoic acid mol­ecules form a heterodimer through inter­molecular amide-carb­oxy­lic acid N-H...O and carb­oxy­lic acid-pyrimidine O-H...N hydrogen-bond pairs, giving a cyclic motif [graph set R22(8)]. The dihedral angle between the two aromatic ring systems in the sulfamethazine mol­ecule is 88.96 (18)° and the nitro group of the acid is 50% rotationally disordered. Secondary aniline N-H...Osulfone hydrogen-bonding associations give a two-dimensional structure lying parallel to the ab plane.

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