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

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.