Received 27 April 2011
In the title hydrated molecular salt, C12H9N2+·C4H5O6-·2H2O, the cation is almost planar (r.m.s. deviation = 0.014 Å); the carbon skeleton of the anion assumes a trans conformation [C-C-C-C torsion angle = -179.86 (14)°]. The carboxyl end of one hydrogen tartrate anion forms a short hydrogen bond to the carboxylate end of another anion [OO = 2.508 (2) Å] in a head-to-tail manner, forming a chain; the chains and water molecules interact, generating an O-HO hydrogen-bonded layer. The cation binds to the layer by an N-HO hydrogen bond.
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); 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: BT5536 ).
We thank the University of Malaya for supporting this study.
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Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Wang, Z.-L., Li, M.-X., Wei, L.-H. & Wang, J.-P. (2006). Acta Cryst. E62, o2508-o2509.
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920-925.