Poly[[di-mu3-acetato-di-mu2-aqua-diaqua-di-mu3-hydroxo-tricopper(II)] naphthalene-1,5-disulfonate].

The crystal structure of the title complex, {Cu3(C2H3O2)2(OH)2(H2O)4}n, is built of infinite polymeric cationic {[Cu3(C2H3O2)2(H2O)4(OH)2]2+}n chains stretching along the a axis, with naphthalene-1,5-disulfonate (1,5-nds) anions in between. One independent Cu(II) cation and the 1,5-nds anion occupy special positions on crystallographic inversion centres. Each Cu(II) cation has an octahedral coordination environment formed by two carboxyl O atoms, two hydroxo O atoms and two water molecules. The carboxylate and hydroxo groups perform a bridging function, linking adjacent Cu atoms in the chain, with a shortest Cu...Cu distance of 2.990 (3) A. The chains are further linked into a three-dimensional supramolecular framework via hydrogen-bonding interactions involving the sulfonate groups of the 1,5-nds dianions.