Redetermination of poly[aquadi-μ(3)-oxy­diacetato-dicopper(II)]

The title complex, [Cu(2)(C(4)H(4)O(5))(2)(H(2)O)](n), has a two-dimensional layer structure. The Cu atom has a distorted octa­hedral (CuO(6)) environment and is coordinated by four carboxyl­ate group O atoms from three different oxydiacetate ligands in a planar arrangement and one half-occupancy water mol­ecule and an ether O atom in the axial positions. In the crystal structure, weak intra- and inter­molecular O—H⋯O hydrogen bonds help to stabilize the crystal packing. The structure has already been published [Whitlow & Davey (1975 ▶). J. Chem. Soc. Dalton. Trans. pp. 1228–1232]; this redetermination reports the structure with higher precision.