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Acta Cryst. (2009). E65, i29 [ doi:10.1107/S1600536809009702 ]
Abstract: The title compound, octaaqua(hydrogendifluorido)dicopper(II) hexafluoridoaluminate dihydrate, was obtained under hydrothermal conditions. The structure is isotypic with that of the analogous FeIII compound, [Cu2(HF2)(H2O)8][FeF6]·2H2O. The coordination sphere of the CuII atom is formed by one F and three water O atoms at short distances < 2 Å and is augmented by two additional water O atoms at significantly longer distances, leading to a considerably distorted octahedral environment. By edge-sharing, these octahedra form dimeric [Cu2(HF2)(H2O)8]3+ units that are bonded to [AlF6]3- anions (
symmetry) and to crystal lattice water molecules via hydrogen bonds. Besides F-H
F interactions between the dimeric cationic units, O-HF and O-HO hydrogen bonds (both in part bifurcated) are observed.
Online 19 March 2009
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