Cd2C5H2(NO2)3 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one N(1), one N(3), one O(1), and four equivalent O(3) atoms to form CdN2O5 pentagonal bipyramids that share  a cornercorner with one Cd(2)NO6 pentagonal bipyramid and edges with two equivalent Cd(1)N2O5 pentagonal bipyramids. The Cd(1)-N(1) bond length is 2.33 Å. The Cd(1)-N(3) bond length is 2.36 Å. The Cd(1)-O(1) bond length is 2.31 Å. There are two shorter (2.41 Å) and two longer (2.52 Å) Cd(1)-O(3) bond lengths. In the second Cd site, Cd(2) is bonded to one N(2), one O(1), one O(2), and four equivalent O(4) atoms to form CdNO6 pentagonal bipyramids that share  a cornercorner with one Cd(1)N2O5 pentagonal bipyramid and edges with two equivalent Cd(2)NO6 pentagonal bipyramids. The Cd(2)-N(2) bond length is 2.25 Å. The Cd(2)-O(1) bond length is 2.40 Å. The Cd(2)-O(2) bond length is 2.31 Å. There are two shorter (2.40 Å) and two longer (2.46 Å) Cd(2)-O(4) bond lengths. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(1)-N(1) bond length is 1.36 Å. The C(1)-N(3) bond length is 1.33 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(2) atom. The C(2)-N(1) bond length is 1.35 Å. The C(2)-N(2) bond length is 1.33 Å. The C(2)-H(2) bond length is 1.08 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) 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(3) and one O(4) atom. The C(4)-O(3) bond length is 1.26 Å. The C(4)-O(4) bond length is 1.27 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(1), and one C(2) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(2), and one N(3) atom. The N(2)-N(3) bond length is 1.37 Å. In the third N site, N(3) is bonded in a 3-coordinate geometry to one Cd(1), one C(1), and one N(2) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cd(1), one Cd(2), and one C(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cd(2) and one C(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Cd(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Cd(2) and one C(4) atom. Linkers: 6 [O]C(=O)C([O])=O ,4 C1=NN=C[N]1. Metal clusters: 8 [Cd]. The MOF has largest included sphere 2.28 A, density 3.21 g/cm3, surface area 1881.72 m2/g, accessible volume 0.06 cm3/g