CdC9H6O4 crystallizes in the orthorhombic Pna2_1 space group. Cd(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. The Cd(1)-O(1) bond length is 2.24 Å. The Cd(1)-O(2) bond length is 2.25 Å. The Cd(1)-O(4) bond length is 2.30 Å. There is one shorter (2.25 Å) and one longer (2.53 Å) Cd(1)-O(3) bond length. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.24 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.36 Å. The C(2)-C(7) bond length is 1.42 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(1) bond length is 0.93 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 1.41 Å. The C(4)-C(8) bond length is 1.47 Å. In the fifth C site, C(5) is bonded in a single-bond geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.35 Å. The C(5)-H(2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(9) atom. The C(6)-C(7) bond length is 1.43 Å. The C(6)-C(9) bond length is 1.53 Å. In the seventh C site, C(7) is bonded in a single-bond geometry to one C(2), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a trigonal non-coplanar geometry to one C(4), one H(4), one H(5), and one H(6) atom. The C(8)-H(4) bond length is 0.96 Å. The C(8)-H(5) bond length is 0.96 Å. The C(8)-H(6) bond length is 0.96 Å. In the ninth C site, C(9) is bonded in a bent 120 degrees geometry to one C(6), 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 1.21 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) 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(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(8) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cd(1) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Cd(1) and one C(9) atom. Linkers: 4 Cc1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 4 [Cd]. The MOF has largest included sphere 5.16 A, density 1.48 g/cm3, surface area 3397.93 m2/g, accessible volume 0.41 cm3/g