Poly[hexaaquacopper(II) [di-μ3-sulfato-disodiate(I)]]

The title compound, {[Cu(H2O)6][Na2(SO4)2]}n, has been prepared under mild hydrothermal conditions and has been structurally characterized. It exhibits a structure in which the inorganic frameworks are three-dimensional, participating in extensive hydrogen bonding. Copper occupies a special position (overline{1}). The Na atom is coordinated by five O atoms of four sulfates [Na-O distances are between 2.825 (3) and 2.983 (3) Å]. The four O atoms of the sulfate ligand are coordinated to four Na atoms, the sulfate ligands coordinating in a chelating/bridging tetradentate mode.