title: Tetra-sodium (dihydrogenhepta-oxido-digermanato)bis-(dihydrogentetra-oxido-germanato)dicopper(II) monohydrate.
abstract: In the hydro/solvothermally synthesized title compound, Na(4)[Cu(2)(H(2)Ge(2)O(7))(H(2)GeO(4))(2)]·H(2)O, the framework building units include CuO(4), GeO(2)(OH)(2) and GeO(3)(OH) tetra-hedra, the latter being condensed into H(2)Ge(2)O(7) (4-) dimers. All the tetra-hedra are connected by corner-sharing into four-membered-ring (4MR) secondary building units containing two CuO(4), one GeO(2)(OH)(2) and one GeO(3)(OH) entity. The 4MRs form chains by corner-sharing the Cu unit and adjacent chains are linked by H(2)Ge(2)O(7) (4-) dimers, generating layers containing ten-membered rings. Three sodium cations (one with site symmetry and one with site symmetry 2) and a water mol-ecule (O-atom site symmetry 2) complete the structure. A network of O-H⋯O hydrogen bonds helps to consolidate the packing.
authors.affiliation: School of Chemical Engineering, Changchun University of Technology, Changchun 130012, People's Republic of China.
authors.forename: Ya-Feng
authors.initials: YF
authors.lastname: Li
authors.forename: Dan-Ping
authors.initials: DP
authors.lastname: Li
authors.forename: Cui-Li
authors.initials: CL
authors.lastname: Shi
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Hu
authors.forename: Li
authors.initials: L
authors.lastname: Jin