CdC8(NO2)2 crystallizes in the tetragonal P4_2/nmc space group. Cd(1) is bonded to two equivalent N(1) and four equivalent O(2) atoms to form distorted edge-sharing CdN2O4 pentagonal pyramids. Both Cd(1)-N(1) bond lengths are 2.27 Å. There are two shorter (2.28 Å) and two longer (2.45 Å) Cd(1)-O(2) bond lengths. There are five 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 1.46 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one N(1) atom. The C(2)-C(2) bond length is 1.39 Å. The C(2)-N(1) bond length is 1.37 Å. In the third C site, C(3) is bonded in a single-bond geometry to one C(4) atom. The C(3)-C(4) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(3) atoms. The C(4)-C(5) bond length is 1.47 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4) and two equivalent N(1) atoms. Both C(5)-N(1) bond lengths are 1.34 Å. N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(2), and one C(5) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one C(1) atom. In the second O site, O(1) is bonded in a single-bond geometry to one C(1) atom. Linkers: 7 [C][C]([C])C1=NC(C([O])=O)=C(C([O])=O)[N]1. Metal clusters: 8 [Cd]. The MOF has largest included sphere 3.92 A, density 2.23 g/cm3, surface area 2855.22 m2/g, accessible volume 0.12 cm3/g