Received 24 October 2008
In the crystal structure of the title compound, 2C5H5N4O+·SO42-, N-HO hydrogen bonds assemble the molecules into a two-dimensional network structure parallel to the cb plane. The S atom of the sulfate ion lies on a special position on a twofold axis.
For general background, see: Elion et al. (1962); Rundles et al. (1966). For related structures, see: Prusiner & Sundaralingam (1972); Gadret et al. (1974); Sheldrick & Bell (1987); Singh & Pedersen (1993).
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: GW2054 ).
NVR thanks Birla Institute of Technology for financial support. NVR also thanks Prashant M. Bhatt and Professor Gautam R. Desiraju, University of Hyderabad, for help in X-ray diffraction, and Matrix Labs Ltd, Hyderabad, for a gift sample of allopurinol.
Bruker (1997). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
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