(IUCr) Crystallography Journals Online

Acta Cryst. (2009). E65, i27 [ doi:10.1107/S1600536809007715 ]

Tetrasodium (dihydrogenheptaoxidodigermanato)bis(dihydrogentetraoxidogermanato)dicopper(II) monohydrate

Y.-F. Li, D.-P. Li, C.-L. Shi, Y.-S. Hu and L. Jin

Abstract: In the hydro/solvothermally synthesized title compound, Na₄[Cu₂(H₂Ge₂O₇)(H₂GeO₄)₂]·H₂O, the framework building units include CuO₄, GeO₂(OH)₂ and GeO₃(OH) tetrahedra, the latter being condensed into H₂Ge₂O₇^4- dimers. All the tetrahedra are connected by corner-sharing into four-membered-ring (4MR) secondary building units containing two CuO₄, one GeO₂(OH)₂ and one GeO₃(OH) entity. The 4MRs form chains by corner-sharing the Cu unit and adjacent chains are linked by H₂Ge₂O₇^4- dimers, generating layers containing ten-membered rings. Three sodium cations (one with site symmetry $\\overline{1}$ and one with site symmetry 2) and a water molecule (O-atom site symmetry 2) complete the structure. A network of O-HO hydrogen bonds helps to consolidate the packing.

Online 11 March 2009