CdC6H4(N3O2)2 crystallizes in the trigonal R3m space group. Cd(1) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(3), and one N(4) atom. The Cd(1)-N(1) bond length is 2.27 Å. The Cd(1)-N(2) bond length is 2.27 Å. The Cd(1)-N(3) bond length is 2.27 Å. The Cd(1)-N(4) bond length is 2.27 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(5,7) and two equivalent N(1) atoms. The C(1)-N(5,7) bond length is 1.42 Å. Both C(1)-N(1) bond lengths are 1.35 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(3), and one N(6) atom. The C(2)-N(2) bond length is 1.35 Å. The C(2)-N(3) bond length is 1.35 Å. The C(2)-N(6) bond length is 1.42 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(5,7) and two equivalent N(4) atoms. The C(3)-N(5,7) bond length is 1.42 Å. Both C(3)-N(4) bond lengths are 1.35 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(1,4) atom. The C(4)-N(1) bond length is 1.36 Å. The C(4)-H(1,4) bond length is 1.08 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(2) atom. The C(5)-N(2) bond length is 1.36 Å. The C(5)-H(2) bond length is 1.08 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one N(3) and one H(3) atom. The C(6)-N(3) bond length is 1.36 Å. The C(6)-H(3) bond length is 1.08 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one N(4) and one H(1,4) atom. The C(7)-N(4) bond length is 1.36 Å. The C(7)-H(1,4) bond length is 1.08 Å. There are six 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(4) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(2), and one C(5) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(2), and one C(6) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(3), and one C(7) atom. In the fifth N site, N(5,7) is bonded in a trigonal planar geometry to one C(1) and two equivalent O(1) atoms. Both N(5,7)-O(1) bond lengths are 1.25 Å. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one C(2), one O(2), and one O(3) atom. The N(6)-O(2) bond length is 1.25 Å. The N(6)-O(3) bond length is 1.25 Å. There are three inequivalent H sites. In the first H site, H(1,4) is bonded in a single-bond geometry to one C(4) 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(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(5,7) atom. In the second O site, O(2) is bonded in a single-bond geometry to one N(6) atom. In the third O site, O(3) is bonded in a single-bond geometry to one N(6) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one N(5,7) atom. The O(4)-N(5,7) bond length is 1.25 Å. Linkers: 6 O=[N+]([O-])C1=NC=C[N]1 ,6 O=[N+]([O-])C1=N[CH]C=N1. Metal clusters: 6 [Cd]. The MOF has largest included sphere 12.65 A, density 1.11 g/cm3, surface area 3681.35 m2/g, accessible volume 0.58 cm3/g