CdC18H10(N3O5)2 crystallizes in the orthorhombic Cmme space group. Cd(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent N(1), two equivalent O(2), and two equivalent O(4) atoms. Both Cd(1)-N(1) bond lengths are 2.28 Å. Both Cd(1)-O(2) bond lengths are 2.37 Å. Both Cd(1)-O(4) bond lengths are 2.32 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.37 Å. The C(1)-N(1) bond length is 1.33 Å. The C(1)-H(1) bond length is 0.95 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.35 Å. The C(2)-H(2) bond length is 0.95 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(2) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-N(2) bond length is 1.46 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(3) atom. The C(4)-H(3) bond length is 0.95 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(4) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(4) bond length is 0.95 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(5) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-C(9) bond length is 1.35 Å. The C(6)-H(5) bond length is 0.95 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(10), one C(6), and one N(3) atom. The C(7)-C(10) bond length is 1.38 Å. The C(7)-N(3) bond length is 1.39 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(9) and two equivalent O(2) atoms. The C(8)-C(9) bond length is 1.50 Å. Both C(8)-O(2) bond lengths are 1.25 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(8) and two equivalent C(6) atoms. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11) and two equivalent C(7) atoms. The C(10)-C(11) bond length is 1.52 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(10) and two equivalent O(4) atoms. Both C(11)-O(4) bond lengths are 1.22 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one C(3) and one N(2) atom. The N(2)-N(2) bond length is 1.20 Å. In the third N site, N(3) is bonded in a tetrahedral geometry to one C(7), one O(3), and two equivalent O(1) atoms. The N(3)-O(3) bond length is 1.17 Å. Both N(3)-O(1) bond lengths are 1.30 Å. There are five 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. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one N(3) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one Cd(1) and one C(8) atom. In the third O site, O(3) is bonded in a single-bond geometry to one N(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(1) and one C(11) atom. Linkers: 4 [O]C(=O)c1cc(c(c(c1)[N]1([O])OO1)C(=O)[O])[N]1([O])OO1 ,6 c1cc([N][N]c2ccncc2)ccn1. Metal clusters: 4 [Cd]. The MOF has largest included sphere 4.32 A, density 1.65 g/cm3, surface area 3733.71 m2/g, accessible volume 0.19 cm3/g