Acta Cryst. (2006). E62, o460-o462  [ doi:10.1107/S1600536805042741 ]

Ethylenediammonium bis(trihydrogen 1,2,4,5-benzenetetracarboxylate) dihydrate

X.-F. Li, D.-S. Liu, Q.-Y. Luo and C.-C. Huang

Abstract: Colourless crystals of the title compound, C₂H₁₀N₂²⁺·2C₁₀H₅O₈^-·2H₂O, were isolated from an aqueous solution. The basic structural unit consists of two trihydrogen 1,2,4,5-benzenetetracarboxylate (H₃btec^-) anions, an ethylenediammonium cation and two solvent water molecules. The ethylenediammonium cation is centrosymmetric. The anion has a short intramolecular hydrogen bond of 2.427 (4) Å involving a deprotonated carboxylate group as acceptor. A three-dimensional hydrogen-bonding network defines the crystal packing, and solvent water molecules and the cations occupy voids in the crystal structure.

Online 7 January 2006

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