Acta Cryst. (2002). E58, o1100-o1102  [ doi:10.1107/S1600536802016410 ]

Imidazolium trihydrogen-1,2,4,5-benzenetetracarboxylate

Y.-Q. Sun, J. Zhang and G.-Y. Yang

Abstract: The crystal of the title compound, imidazolium trihydrogen-1,2,4,5-benzenetetracarboxylate, C₃H₅N₂⁺·C₁₀H₅O₈^-, is built of imidazolium cations and trihydrogen-1,2,4,5-benzenetetracarboxylate anions. The anions use two of their `active' H atoms to generate hydrogen bonds linking to the neighbouring anions, thus creating a two-dimensional hydrogen-bonding network parallel to the bc plane of the crystal. The third oxygen-bound H atom of the anion is involved in an intramolecular hydrogen bond, which closes the six-membered pseudo-ring. The imidazolium cations are linked to the anionic hydrogen-bonded network through N-HO bonds which target two of the O atoms of the carboxyl groups of the anions as acceptors. The mean plane of the imidazolium cation is almost orthogonal to the mean plane of the benzene ring of benzenetetracarboxylate, with a dihedral angle of 89.7  (1)°.

Online 20 September 2002

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