Acta Cryst. (2013). E69, m52
[ doi:10.1107/S160053681205026X ]

Poly[[tetraaquadi-₄-fumarato-₂-oxalato-dierbium(III)] tetrahydrate]

Q.-F. Yang, X.-Z. Wang and P. Xue

Abstract: The title compound, {[Er₂(C₄H₂O₄)₂(C₂O₄)(H₂O)₄]·4H₂O}_n, was synthesized by the reaction of erbium nitrate hexahydrate with fumaric acid and oxalic acid under hydrothermal conditions. The Er³⁺ cation (site symmetry ..2) is eight-coordinated by six O atoms from four fumarate anions (site symmetry ..2) and one bidentate oxalate anion (site symmetry 222), and by two water molecules. The complex exhibits a three-dimensional structure consisting of oxalate pillared Er-fumarate layers with channels occupied by coordinating and lattice water molecules. The three-dimensional structure features by O_water-HO hydrogen bonds involving both the coordinating and lattice water molecules.

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