Cd3H6(C2O3)4 crystallizes in the orthorhombic P2_12_12 space group. There are three inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one O(1), one O(11), one O(3), one O(4), and two equivalent O(10) atoms to form distorted edge-sharing CdO6 pentagonal pyramids. The Cd(1)-O(1) bond length is 2.38 Å. The Cd(1)-O(11) bond length is 2.29 Å. The Cd(1)-O(3) bond length is 2.40 Å. The Cd(1)-O(4) bond length is 2.39 Å. There is one shorter (2.30 Å) and one longer (2.37 Å) Cd(1)-O(10) bond length. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to one O(10), one O(5), one O(7), one O(9), and two equivalent O(4) atoms. The Cd(2)-O(10) bond length is 2.37 Å. The Cd(2)-O(5) bond length is 2.33 Å. The Cd(2)-O(7) bond length is 2.32 Å. The Cd(2)-O(9) bond length is 2.57 Å. There is one shorter (2.27 Å) and one longer (2.32 Å) Cd(2)-O(4) bond length. In the third Cd site, Cd(3) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(5), one O(6), one O(7), and one O(8) atom. The Cd(3)-O(12) bond length is 2.21 Å. The Cd(3)-O(2) bond length is 2.20 Å. The Cd(3)-O(5) bond length is 2.60 Å. The Cd(3)-O(6) bond length is 2.25 Å. The Cd(3)-O(7) bond length is 2.49 Å. The Cd(3)-O(8) bond length is 2.32 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.23 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted water-like geometry to one H(3) and one O(3) atom. The C(2)-H(3) bond length is 1.00 Å. The C(2)-O(3) bond length is 1.41 Å. In the third C site, C(3) is bonded in a distorted water-like geometry to one C(4), one H(4), and one O(4) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-H(4) bond length is 1.00 Å. The C(3)-O(4) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one O(5), and one O(6) atom. The C(4)-O(5) bond length is 1.26 Å. The C(4)-O(6) bond length is 1.28 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(5)-O(7) bond length is 1.26 Å. The C(5)-O(8) bond length is 1.26 Å. In the sixth C site, C(6) is bonded in a distorted water-like geometry to one H(5) and one O(9) atom. The C(6)-H(5) bond length is 1.00 Å. The C(6)-O(9) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a distorted water-like geometry to one C(8), one H(6), and one O(10) atom. The C(7)-C(8) bond length is 1.52 Å. The C(7)-H(6) bond length is 1.00 Å. The C(7)-O(10) bond length is 1.38 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(7), one O(11), and one O(12) atom. The C(8)-O(11) bond length is 1.25 Å. The C(8)-O(12) bond length is 1.27 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.85 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.85 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(7) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Cd(3) and one C(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Cd(1), one C(2), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(1), two equivalent Cd(2), and one C(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cd(2), one Cd(3), and one C(4) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Cd(3) and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Cd(2), one Cd(3), and one C(5) atom. In the eighth O site, O(8) is bonded in a distorted L-shaped geometry to one Cd(3) and one C(5) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Cd(2), one C(6), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Cd(2), two equivalent Cd(1), and one C(7) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(8) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Cd(3) and one C(8) atom. Linkers: 7 [O]C(=O)[C@@H]([O])[C@H](O)C([O])=O. Metal clusters: 12 [Cd]. The MOF has largest included sphere 4.52 A, density 2.07 g/cm3, surface area 2201.51 m2/g, accessible volume 0.23 cm3/g