CdH3(C3O2)3 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Cd(1)-O(1) bond length is 2.43 Å. The Cd(1)-O(2) bond length is 2.36 Å. The Cd(1)-O(3) bond length is 2.26 Å. The Cd(1)-O(4) bond length is 2.34 Å. The Cd(1)-O(5) bond length is 2.27 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(5), one C(8), and one C(9) atom. The C(1)-C(5) bond length is 1.39 Å. The C(1)-C(8) bond length is 1.39 Å. The C(1)-C(9) bond length is 1.51 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(7) atom. The C(2)-C(4) bond length is 1.51 Å. The C(2)-C(5) bond length is 1.40 Å. The C(2)-C(7) bond length is 1.39 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(6), one C(7), and one C(8) atom. The C(3)-C(6) bond length is 1.50 Å. The C(3)-C(7) bond length is 1.39 Å. The C(3)-C(8) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(5) atom. The C(4)-O(3) bond length is 1.25 Å. The C(4)-O(5) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(1); one C(2); and one H(1,2) atom. The C(5)-H(1,2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.26 Å. The C(6)-O(2) bond length is 1.25 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2); one C(3); and one H(1,2) atom. The C(7)-H(1,2) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(3) atom. The C(8)-H(3) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(4), and one O(6) atom. The C(9)-O(4) bond length is 1.25 Å. The C(9)-O(6) bond length is 1.25 Å. There are two inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(8) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted linear geometry to one Cd(1) and one C(4) atom. In the second O site, O(1) is bonded in a distorted L-shaped geometry to one Cd(1) and one C(6) atom. In the third O site, O(2) is bonded in an L-shaped geometry to one Cd(1) and one C(6) atom. In the fourth O site, O(3) is bonded in a water-like geometry to one Cd(1) and one C(4) atom. In the fifth O site, O(4) is bonded in a water-like geometry to one Cd(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one C(9) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 O=[C]O[Cd]12(O[C]O1)O[C]O[Cd]1(O[C]=O)(O[C]O1)O[C]O2. RCSR code: rtl. The MOF has largest included sphere 6.70 A, density 1.13 g/cm3, surface area 3389.16 m2/g, accessible volume 0.54 cm3/g