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Acta Cryst. (2012). E68, o3257-o3258
[ doi:10.1107/S1600536812044492 ]

Tris(5-amino-1H-1,2,4-triazol-4-ium) dihydrogenphosphate hydrogenphosphate trihydrate

M. L. Mrad, M. Zeller, K. J. Hernandez, M. Rzaigui and C. Ben Nasr

Abstract: In the crystal structure of the title molecular salt, 3C2H5N4+·HPO42-·H2PO4-·3H2O, the phosphate-based framework is built upon layers parallel to (010) made up from the H2PO4- and HPO42- anions and water molecules, which are interconnected through O-H...O hydrogen bonds. The organic cations are located between the phosphate-water layers and are connected to them via N-H...O hydrogen bonds. The bond-length features are consistent with an imino resonance form for the exocyclic amino group, as is commonly found for a C-N single bond involving sp2-hybridized C and N atoms.

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