Cd2(CO2)7 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Cd(1)-O(1) bond length is 2.30 Å. The Cd(1)-O(2) bond length is 2.30 Å. The Cd(1)-O(3) bond length is 2.33 Å. The Cd(1)-O(4) bond length is 2.33 Å. The Cd(1)-O(5) bond length is 2.31 Å. The Cd(1)-O(6) bond length is 2.37 Å. The Cd(1)-O(7) bond length is 2.37 Å. In the second Cd site, Cd(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(5), one O(6), one O(8), and one O(9) atom. The Cd(2)-O(10) bond length is 2.33 Å. The Cd(2)-O(11) bond length is 2.34 Å. The Cd(2)-O(12) bond length is 2.36 Å. The Cd(2)-O(13) bond length is 2.37 Å. The Cd(2)-O(14) bond length is 2.51 Å. The Cd(2)-O(5) bond length is 2.40 Å. The Cd(2)-O(6) bond length is 2.41 Å. The Cd(2)-O(8) bond length is 2.41 Å. The Cd(2)-O(9) bond length is 2.41 Å. There are seven 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(11) atom. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(11) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(2)-O(3) bond length is 1.24 Å. The C(2)-O(5) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(6) atom. The C(3)-O(12) bond length is 1.23 Å. The C(3)-O(6) bond length is 1.26 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(8) atom. The C(4)-O(2) bond length is 1.26 Å. The C(4)-O(8) bond length is 1.23 Å. In the fifth C site, C(5) is bonded in a 3-coordinate geometry to one C(7), one O(7), and one O(9) atom. The C(5)-C(7) bond length is 0.91 Å. The C(5)-O(7) bond length is 1.29 Å. The C(5)-O(9) bond length is 1.00 Å. In the sixth C site, C(6) is bonded in a 2-coordinate geometry to one O(10), one O(14), and one O(4) atom. The C(6)-O(10) bond length is 1.26 Å. The C(6)-O(14) bond length is 1.95 Å. The C(6)-O(4) bond length is 1.46 Å. In the seventh C site, C(7) is bonded in a 5-coordinate geometry to one C(5), one C(7), one O(13), one O(7), and one O(9) atom. The C(7)-C(7) bond length is 1.57 Å. The C(7)-O(13) bond length is 1.27 Å. The C(7)-O(7) bond length is 1.38 Å. The C(7)-O(9) bond length is 1.23 Å. There are fourteen 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(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(6) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one C(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Cd(1), one C(5), one C(7), and one O(13) atom. The O(7)-O(13) bond length is 0.90 Å. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Cd(2) and one C(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Cd(2), one C(5), and one C(7) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Cd(2), one C(6), and one O(14) atom. The O(10)-O(14) bond length is 1.16 Å. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Cd(2) and one C(1) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Cd(2), one C(7), and one O(7) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Cd(2), one C(6), one O(10), and one O(14) atom. The O(14)-O(14) bond length is 1.91 Å. Linkers: 14 [O]C(=O)C([O])=O ,1 [O]OC(=O)[C@@]12OO[C@]1([C@@]13OO[C@]1(C(=O)O[O])O3)O2 ,3 [O]OC(=O)[C@@]12OO[C]1O2.[O]OC(=O)[C@]12OO[C]1O2. Metal clusters: 16 [Cd]. The MOF has largest included sphere 5.35 A, density 2.33 g/cm3, surface area 2057.97 m2/g, accessible volume 0.15 cm3/g