Cu4Cd(SO3)4 crystallizes in the orthorhombic Pban space group. Cu(1) is bonded in a rectangular see-saw-like geometry to one S(1), one O(1), one O(2), and one O(3) atom. The Cu(1)-S(1) bond length is 2.15 Å. The Cu(1)-O(1) bond length is 2.15 Å. The Cu(1)-O(2) bond length is 2.14 Å. The Cu(1)-O(3) bond length is 2.08 Å. Cd(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All Cd(1)-O(1) bond lengths are 2.57 Å. All Cd(1)-O(2) bond lengths are 2.34 Å. S(1) is bonded in a tetrahedral geometry to one Cu(1), one O(1), one O(2), and one O(3) atom. The S(1)-O(1) bond length is 1.52 Å. The S(1)-O(2) bond length is 1.53 Å. The S(1)-O(3) bond length is 1.50 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one Cd(1), and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one Cd(1), and one S(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one S(1) atom. Linkers: 8 O=S(=O)=O. Metal clusters: 2 [Cd] ,8 [Cu]. The MOF has largest included sphere 4.39 A, density 2.85 g/cm3, surface area 1949.99 m2/g, accessible volume 0.15 cm3/g