Experimental

0.044; wR factor = 0.115; data-to-parameter ratio = 16.5. The asymmetric unit of the title co-crystal, C12H14N4O2S-0.5C6H12N2, comprises the sulfonamide molecule and half a molecule of 1,4-diazabicyclo[2.2.2]octane (DABCO), the latter being disposed about a crystallographic twofold rotation axis. In the sulfonamide molecule, the aromatic rings are almost perpendicular to one another [dihedral angle = 75.01 (8)]. In the crystal, molecules are connected into a three-molecule aggregate via amide–DABCO N—H N hydrogen bonds, and these are connected into a three-dimensional architecture via amino–DABCO N—H O and amino-pyrimidine N—H N hydrogen bonds. Related literature For the structure of the sulfonamide, see: Tiwari et al. (1984). For related studies of co-crystal formation, see: Ellis et al. (2009); Arman & Tiekink (2013). For co-crystals of the sulfonamide with carboxylic acids, see: Arman et al. (2010)