SrZrCdH8(C2O5)4 crystallizes in the tetragonal I-4m2 space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(5) atoms. All Sr(1)-O(1) bond lengths are 2.65 Å. All Sr(1)-O(5) bond lengths are 2.55 Å. Zr(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(4) atoms. All Zr(1)-O(2) bond lengths are 2.19 Å. All Zr(1)-O(4) bond lengths are 2.25 Å. Cd(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. All Cd(1)-O(1) bond lengths are 2.49 Å. All Cd(1)-O(3) bond lengths are 2.41 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(1)-O(3) bond length is 1.26 Å. The C(1)-O(4) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.24 Å. The C(2)-O(2) bond length is 1.29 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.97 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 0.98 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Cd(1), and one C(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zr(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zr(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one H(1), and one H(2) atom. Linkers: 4 [O]C(=O)C([O])=O. Metal clusters: 1 [Sr] ,1 [Zr] ,1 [Cd]. The MOF has largest included sphere 2.88 A, density 2.14 g/cm3, surface area 2447.91 m2/g, accessible volume 0.12 cm3/g