Poly[[tetra-μ₂-aqua-diaqua-μ ₂-2,5-dibenzoyl-terephthalatodipotassium(I)] dihydrate]

The title compound, {[K₂(C₂₂H₁₂O ₆)(H₂O)₆]·2H₂O}_n, was prepared by slow evaporation of an aqueous solution of potassium dibenzoylterephthalate. The molecular complex contains two potassium cations, one 2,5-dibenzoyl-terephthalate anion, six coordinated water molecules and two uncoordinated water molecules. The 2,5-dibenzoylterephthalate anion lies on a center of symmetry. Each potassium cation is coordinated by seven O atoms, two from 2,5-dibenzoylterephthalate anions and the remainder from four bridging and one terminal water molecules. The uncoordinated water molecules are linked to the carboxylate O atoms and the coordinated water molecules by a network of intermolecular O - H⋯O hydrogen bonds, forming a layer structure.