Received 30 September 2013
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-HN hydrogen bonds, and these are connected into a three-dimensional architecture via amino-DABCO N-HO and amino-pyrimidine N-HN hydrogen bonds.
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); Ghosh et al. (2011); Smith & Wermuth (2013).
Data collection: CrystalClear (Molecular Structure Corporation & Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2652 ).
We are grateful to the Ministry of Higher Education (Malaysia) and the University of Malaya (UM) for funding structural studies through the High-Impact Research scheme (UM·C/HIR-MOHE/SC/03).
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