Cd3C18H14(NO3)4 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 distorted octahedral geometry to one N(1), one O(1), one O(2), one O(3), one O(5), and one O(6) atom. The Cd(1)-N(1) bond length is 2.22 Å. The Cd(1)-O(1) bond length is 2.53 Å. The Cd(1)-O(2) bond length is 2.29 Å. The Cd(1)-O(3) bond length is 2.39 Å. The Cd(1)-O(5) bond length is 2.38 Å. The Cd(1)-O(6) bond length is 2.43 Å. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to two equivalent N(2), two equivalent O(3), and two equivalent O(4) atoms. Both Cd(2)-N(2) bond lengths are 2.24 Å. Both Cd(2)-O(3) bond lengths are 2.64 Å. Both Cd(2)-O(4) bond lengths are 2.35 Å. There are nine 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 1.49 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(8) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(8) bond length is 1.42 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(6), and one N(1) atom. The C(4)-C(6) bond length is 1.42 Å. The C(4)-N(1) bond length is 1.38 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(2) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-N(2) bond length is 1.35 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(7), and one N(2) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-N(2) bond length is 1.38 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6), one C(8), and one H(3) atom. The C(7)-C(8) bond length is 1.39 Å. The C(7)-H(3) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(2), one C(7), and one C(9) atom. The C(8)-C(9) bond length is 1.49 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(3), and one O(4) atom. The C(9)-O(3) bond length is 1.27 Å. The C(9)-O(4) bond length is 1.30 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(4), and one C(5) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(5), and one C(6) atom. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(6) atom. The H(5)-O(6) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(5) atom. The H(6)-O(5) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(5) atom. The H(7)-O(5) bond length is 0.99 Å. There are six 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 distorted L-shaped geometry to one Cd(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1), one Cd(2), and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(2) and one C(9) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Cd(1), one H(6), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Cd(1), one H(4), and one H(5) atom. Linkers: 4 [O]C(=O)c1cc2c(cc1C([O])=O)N=C[N]2. Metal clusters: 2 O.O.O.O.[C](O[Cd]O[C]O[Cd]1O[C]O1)O[Cd]1O[C]O1. RCSR code: sql. The MOF has largest included sphere 2.61 A, density 2.37 g/cm3, surface area 2784.81 m2/g, accessible volume 0.09 cm3/g