Cd3H12(C17O9)2 crystallizes in the orthorhombic Ccce space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to four equivalent O(3) and four equivalent O(4) atoms to form distorted edge-sharing CdO8 hexagonal bipyramids. All Cd(1)-O(3) bond lengths are 2.55 Å. All Cd(1)-O(4) bond lengths are 2.32 Å. In the second Cd site, Cd(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted edge-sharing CdO6 pentagonal pyramids. Both Cd(2)-O(1) bond lengths are 2.21 Å. Both Cd(2)-O(2) bond lengths are 2.28 Å. Both Cd(2)-O(3) bond lengths are 2.43 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(9) atom. The C(1)-C(2) bond length is 1.38 Å. The C(1)-C(6) bond length is 1.37 Å. The C(1)-C(9) bond length is 1.50 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(7) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-C(7) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-C(8) bond length is 1.51 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(5)-H(2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1) and one H(3) atom. The C(6)-H(3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.26 Å. The C(7)-O(2) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.27 Å. The C(8)-O(4) bond length is 1.24 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to two equivalent C(1) and one O(5) atom. The C(9)-O(5) bond length is 1.22 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(7) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(7) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1), one Cd(2), and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Cd(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(9) atom. Linkers: 8 [O]C(=O)c1ccc(C(=O)c2ccc(C([O])=O)c(C([O])=O)c2)cc1C([O])=O. Metal clusters: 12 [Cd]. The MOF has largest included sphere 4.76 A, density 1.55 g/cm3, surface area 3230.02 m2/g, accessible volume 0.34 cm3/g