Poly[(μ-3,5-dinitrobenzoato)(μ-3,5-dinitrobenzoic acid)rubidium]

The asymmetric unit of the title compound, [Rb(C7H3N2O6)(C7H4N2O6)]n, comprises an Rb+ cation, a 3,5-dinitrobenzoate anion and a 3,5-dinitrobenzoic acid ligand. The Rb+ cation is nine-coordinated by O atoms from four 3,5-dinitrobenzoate anions and three neutral 3,5-dinitrobenzoic acid ligands. The metal atom is firstly linked by four bridging carboxyl groups, forming a binuclear motif, which is further linked by the nitro groups into a two-dimensional framework along the [110] direction. A short O—H⋯O hydrogen bond between two adjacent carboxy/carboxylate groups occurs.