Received 24 February 2011
aFaculté des Sciences et Technologie et Sciences de la Matière, Université Kasdi Merbah Ouargla, Route Gardaia, Ourgla, Algeria, and bLaboratoire Sciences Chimiques de Rennes (CNRS, UMR 6226), Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France
Correspondence e-mail: email@example.com
The title compound, C2H10N22+·2HC4O4-·H2O, a new polymorph of ethylenediammonium bis(hydrogen squarate) monohydrate, was synthesized by slow evaporation of an acid solution. The asymetric unit contains two hydrogen squarate anions, two half-molecules of protonated ethylenediamine arranged around a twofold axis and one water molecule. In the crystal, N-HO and O-HO hydrogen bonds between the hydrogen squarate anions, protonated N atoms from the amine group and water molecules lead to a three-dimensional framework. In particular, the cohesion between the squarate groups is ensured by very short intermolecular hydrogen bonds bonds. The title compound crystallized together with the previously reported polymorph [Mathew et al. (2002). J. Mol. Struct. 641, 263-279].
Data collection: COLLECT (Nonius, 2000); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO (Otwinowski & Minor, 1997) and SCALEPACK; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Berndt, 2001); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: DN2662 ).
Grateful thanks are expressed to Dr T. Roisnel (Centre de Diffractomtétrie X, UMR CNRS 6226) for his assistance with the single-crystal data collection.
Altomare, A., Burla, M. C., Camalli, M., Cascarano, G. L., Giacovazzo, C., Guagliardi, A., Moliterni, A. G. G., Polidori, G. & Spagna, R. (1999). J. Appl. Cryst. 32, 115-119.
Brandenburg, K. & Berndt, M. (2001). DIAMOND. Crystal Impact GbR, Bonn, Germany.
Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837-838.
Mathew, S., Paul, G., Shivasankar, K., Choudhury, A. & Rao, C. N. R. (2002). J. Mol. Struct. 641, 263-279.
Nonius (2000). COLLECT, Nonius BV, Delft, The Netherlands.
Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307-326. New York: Academic Press.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.