Acta Cryst. (2004). E60, m641-m643  [ doi:10.1107/S1600536804008815 ]

Potassium trihydrogen 1,2,4,5-benzenetetracarboxylate trihydrate

C. Wang, X. Chen, C. Huang, H. Zhang, Z. Lian and G. Xiao

Abstract: Colourless crystal of the title compound, K⁺·C₁₀H₅O₈^-·3H₂O, were isolated under hydrothermal conditions (423  K, 72  h). The structure consists of trihydrogen 1,2,4,5-benzenetetracarboxylate (H₃btec^-) anions, potassium cations and water of crystallization. Each K⁺ cation is seven-coordinated by four carboxylate O atoms and three water O atoms. In turn, each H₃btec^- anion connects to four K⁺ cations and so an undulating layer forms. Adjacent layers are held together by hydrogen bonds to form a three-dimensional network. A short intramolecular hydrogen bond is found to exist in the H₃btec^- anions.

Online 24 April 2004

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