[Cu(2)(HF(2))(H(2)O)(8)][FeF(6)]·2H(2)O

The title compound, octaaqua­(hydrogenfluorido)dicopper(II) hexa­fluoridoferrate(III) dihydrate, was synthesized under hydro­thermal conditions. The Cu atom is coordinated by one F and five O atoms within a highly distorted octa­hedron, forming dimeric [Cu(2)(H(2)O)(8)HF(2)](3+) units by edge sharing. These units are hydrogen bonded to [FeF(6)](3−) anions and to an inter­stitial water mol­ecule. The former feature Fe(3+) on a special position ([Image: see text]). The dimeric copper units are linked to adjacent dimers by F—H⋯F hydrogen bonds. Additional O—H⋯O and O—H⋯F hydrogen bonds help to consolidate the crystal packing.