[Cu2(HF2)(H2O)8][FeF6]·2H2O

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 [Cu2(H2O)8HF2]3+ units by edge sharing. These units are hydrogen bonded to [FeF6]3− anions and to an inter­stitial water mol­ecule. The former feature Fe3+ on a special position (\overline{1}). 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.