CdH8(C2O)8 crystallizes in the orthorhombic Pbcn space group. Cd(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Both Cd(1)-O(1) bond lengths are 2.34 Å. Both Cd(1)-O(2) bond lengths are 2.27 Å. Both Cd(1)-O(4) bond lengths are 2.36 Å. There are eight 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(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.41 Å. The C(1)-C(7) bond length is 1.49 Å. In the second C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(3) bond length is 1.09 Å. In the third 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 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(2) atom. The C(4)-C(3) bond length is 1.40 Å. The C(4)-H(2) bond length is 1.09 Å. In the fifth C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(6) atom. The C(6)-C(6) bond length is 1.49 Å. In the sixth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(8)-C(3) bond length is 1.48 Å. The C(8)-O(3) bond length is 1.32 Å. The C(8)-O(4) bond length is 1.25 Å. In the seventh C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. In the eighth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.29 Å. The C(7)-O(2) bond length is 1.26 Å. There are four 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a linear geometry to one O(1) and one O(3) atom. The H(4)-O(1) bond length is 1.51 Å. The H(4)-O(3) bond length is 1.04 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(7), and one H(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(7) atom. In the third O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one C(8) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one C(8) and one H(4) atom. Linkers: 4 [O]C(=O)c1cc(C(=O)O)ccc1-c1ccc(C(=O)O)cc1C([O])=O. Metal clusters: 4 [Cd]. RCSR code: bnn. The MOF has largest included sphere 2.18 A, density 2.02 g/cm3, surface area 3414.94 m2/g, accessible volume 0.15 cm3/g