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The title compound, {[Er 2 (C 4 H 2 O 4 ) 2 (C 2 O 4 )(H 2 O) 4 ]·4H 2 O}  n  , was synthesized by the reaction of erbium nitrate hexa­hydrate with fumaric acid and oxalic acid under hydro­thermal conditions. The Er 3+  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 —H⋯O hydrogen bonds involving both the coordinating and lattice water mol­ecules.

Poly[[tetraaquadi-μ4-fumarato-μ2-oxalato-dierbium(III)] tetrahydrate]

Poly[[tetraaquadi-μ₄-fumarato-μ₂-oxalato-dierbium(III)] tetrahydrate]