BaC2H4(N5O)2 crystallizes in the monoclinic C2/c space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent N(4), two equivalent N(5), and four equivalent O(1) atoms. Both Ba(1)-N(4) bond lengths are 3.05 Å. Both Ba(1)-N(5) bond lengths are 2.93 Å. There are two shorter (2.84 Å) and two longer (2.87 Å) Ba(1)-O(1) bond lengths. C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(5) atom. The C(1)-N(1) bond length is 1.41 Å. The C(1)-N(2) bond length is 1.33 Å. The C(1)-N(5) bond length is 1.33 Å. There are five inequivalent N sites. In the first N site, N(5) is bonded in a distorted single-bond geometry to one Ba(1), one C(1), and one N(4) atom. The N(5)-N(4) bond length is 1.34 Å. In the second N site, N(1) is bonded in a distorted bent 120 degrees geometry to one C(1) and one N(1) atom. The N(1)-N(1) bond length is 1.25 Å. In the third N site, N(2) is bonded in a distorted single-bond geometry to one C(1) and one N(3) atom. The N(2)-N(3) bond length is 1.34 Å. In the fourth N site, N(3) is bonded in a water-like geometry to one N(2) and one N(4) atom. The N(3)-N(4) bond length is 1.31 Å. In the fifth N site, N(4) is bonded in a distorted trigonal planar geometry to one Ba(1), one N(3), and one N(5) atom. 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 0.83 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 0.83 Å. O(1) is bonded in a water-like geometry to two equivalent Ba(1), one H(1), and one H(2) atom. Linkers: 2 N1=NN=[C](=N1)[N][N][C]1=NN=NN=1. Metal clusters: 2 [Ba]. The MOF has largest included sphere 3.81 A, density 1.98 g/cm3, surface area 3068.84 m2/g, accessible volume 0.15 cm3/g