KBaC8NH6O8 crystallizes in the monoclinic C2/c space group. K(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form distorted edge-sharing KO6 octahedra. Both K(1)-O(4) bond lengths are 2.74 Å. There are two shorter (2.67 Å) and two longer (2.70 Å) K(1)-O(2) bond lengths. Ba(1) is bonded in a 9-coordinate geometry to one N(1), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. The Ba(1)-N(1) bond length is 2.94 Å. Both Ba(1)-O(3) bond lengths are 3.01 Å. Both Ba(1)-O(4) bond lengths are 2.87 Å. There are two shorter (2.80 Å) and two longer (2.90 Å) Ba(1)-O(1) bond lengths. There are five 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 1.52 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one N(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-N(1) bond length is 1.35 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 1.40 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(3) atoms. The C(4)-C(5) bond length is 1.51 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4) and two equivalent O(3) atoms. Both C(5)-O(3) bond lengths are 1.27 Å. N(1) is bonded in a bent 120 degrees geometry to one Ba(1) and two equivalent C(2) atoms. There are three 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 O(4) atom. The H(2)-O(4) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(4) atom. The H(3)-O(4) bond length is 0.99 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one K(1), one Ba(1), one H(2), and one H(3) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)nc(C([O])=O)c1. Metal clusters: 2 [K] ,2 [Ba]. The MOF has largest included sphere 1.22 A, density 2.49 g/cm3, surface area 1616.66 m2/g, accessible volume 0.02 cm3/g