The hydrothermal reaction of CuCl2·2H2O and 4-(1H tetrazol-5-yl)-benzoic acid (H2tba) in the presence of excess HCl yielded the three-dimensional material (Me2NH2)[Cu4Cl(tba)4(H2O)4]·2DMF. The structure is constructed from {Cu4(μ4-Cl)(H2O)4}7+ clusters linked through tba2− ligands into an open framework with 57% void volume. The microporosity and magnetic properties of the material were investigated.