CdC2H4(N5O)2 crystallizes in the tetragonal I4_1/a space group. Cd(1) is bonded in a 6-coordinate geometry to two equivalent N(2), two equivalent N(4), and two equivalent O(1) atoms. Both Cd(1)-N(2) bond lengths are 2.35 Å. Both Cd(1)-N(4) bond lengths are 2.39 Å. Both Cd(1)-O(1) bond lengths are 2.50 Å. C(1) is bonded in a trigonal planar geometry to one N(3), one N(4), and one N(5) atom. The C(1)-N(3) bond length is 1.35 Å. The C(1)-N(4) bond length is 1.35 Å. The C(1)-N(5) bond length is 1.38 Å. There are five inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Cd(1), one N(1), and one N(3) atom. The N(2)-N(1) bond length is 1.34 Å. The N(2)-N(3) bond length is 1.33 Å. In the second N site, N(3) is bonded in a distorted water-like geometry to one C(1) and one N(2) atom. In the third N site, N(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(1), and one N(1) atom. The N(4)-N(1) bond length is 1.32 Å. In the fourth N site, N(1) is bonded in a water-like geometry to one N(2) and one N(4) atom. In the fifth N site, N(5) is bonded in a distorted bent 120 degrees geometry to one C(1) and one N(5) atom. The N(5)-N(5) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 0.99 Å. O(1) is bonded in a distorted water-like geometry to one Cd(1), one H(1), and one H(2) atom. Linkers: 4 N1=NN=[C](=N1)[N][N][C]1=NN=NN=1. Metal clusters: 4 O.O.[Cd]. The MOF has largest included sphere 3.24 A, density 2.34 g/cm3, surface area 3061.17 m2/g, accessible volume 0.09 cm3/g