Poly[bis(μ₄-acetato-κ⁴ O:O:O′: O′)bis(μ₃-acetato-κ³ O:O:O) (μ₂-acetato-κ² O:O′)(μ₂- acetic acid-κ² O:O′)di-μ-aquacopper(II)trisodium]

In the title compound, [CuNa₃(CH₃CO₂) ₅(CH₃COOH)(H₂O)₂]_n, the Cu^II atom lies on an inversion center and is coordinated by four O atoms from four acetate ligands, leading to a square-planar geometry. One Na^I atom, lying on an inversion center, is coordinated by four O atoms from four acetate ligands and two bridging water molecules in a distorted octa-hedral geometry. The other Na^I atom is coordinated by five O atoms from five acetate ligands and a bridging water molecule. A hy-droxy H atom lies on a twofold rotation axis and is shared by two acetate ligands. The crystal packing exhibits a polymeric layer parallel to (100), which is further stablized by intra-layer O - H⋯O hydrogen bonds. The layers are linked by inter-layer O - H⋯O hydrogen bonds.