CdC9H8O8 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. The Cd(1)-O(1) bond length is 2.43 Å. The Cd(1)-O(2) bond length is 2.48 Å. The Cd(1)-O(3) bond length is 2.48 Å. The Cd(1)-O(4) bond length is 2.48 Å. The Cd(1)-O(6) bond length is 2.32 Å. The Cd(1)-O(7) bond length is 2.40 Å. The Cd(1)-O(8) bond length is 2.30 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(8) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(8) 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) and one H(1) atom. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(2) bond length is 1.09 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(9) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-C(9) bond length is 1.50 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.41 Å. The C(5)-C(7) bond length is 1.47 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(7) atom. The C(6)-C(7) bond length is 1.48 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(5), one C(6), and one O(5) atom. The C(7)-O(5) 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(1), one O(1), and one O(2) atom. The C(8)-O(1) bond length is 1.30 Å. The C(8)-O(2) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(9)-O(3) bond length is 1.29 Å. The C(9)-O(4) bond length is 1.26 Å. There are eight 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(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 0.99 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. The H(5)-O(7) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a distorted linear geometry to one O(1) and one O(7) atom. The H(6)-O(1) bond length is 1.61 Å. The H(6)-O(7) bond length is 1.01 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(8) atom. The H(7)-O(8) bond length is 1.00 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(8) atom. The H(8)-O(8) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cd(1), one C(8), and one H(6) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cd(1) and one C(8) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(1) and one C(9) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Cd(1), one H(3), and one H(4) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Cd(1), one H(5), and one H(6) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Cd(1), one H(7), and one H(8) atom. Linkers: 2 [O]C(=O)c1ccc(C([O])=O)c2c1C(=O)c1c(C([O])=O)ccc(C([O])=O)c1C2=O ,2 [O][C]c1[c]cc(C([O])=O)c2c1C(=O)c1c(C([O])=O)ccc(C([O])=O)c1C2=O. Metal clusters: 4 O.O.O.[O][C]O[Cd]1O[C]O1. The MOF has largest included sphere 2.94 A, density 2.15 g/cm3, surface area 3052.55 m2/g, accessible volume 0.11 cm3/g