KC6N5H8O2 crystallizes in the monoclinic C2/c space group. K(1) is bonded to two equivalent N(3) and four equivalent O(1) atoms to form face-sharing KN2O4 octahedra. Both K(1)-N(3) bond lengths are 2.93 Å. There are two shorter (2.73 Å) and two longer (2.74 Å) K(1)-O(1) bond lengths. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2) and two equivalent N(1) atoms. The C(1)-C(2) bond length is 1.46 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 C(1) and two equivalent C(3) atoms. Both C(2)-C(3) bond lengths are 1.40 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 trigonal planar geometry to one C(3), one N(3), and one H(2) atom. The C(4)-N(3) bond length is 1.35 Å. The C(4)-H(2) bond length is 1.09 Å. There are three inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one N(1), one N(2), and one H(4) atom. The N(2)-N(1) bond length is 1.34 Å. The N(2)-N(2) bond length is 1.32 Å. The N(2)-H(4) bond length is 1.81 Å. In the second N site, N(3) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1) and two equivalent C(4) atoms. In the third N site, N(1) is bonded in a distorted single-bond geometry to one C(1), one N(2), and one H(3) atom. The N(1)-H(3) bond length is 1.79 Å. There are four 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(1) and one O(1) atom. The H(3)-O(1) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(2) and one O(1) atom. The H(4)-O(1) bond length is 1.00 Å. O(1) is bonded in a water-like geometry to two equivalent K(1), one H(3), and one H(4) atom. Linkers: 2 c1cc(C2=NN=N[N]2)ccn1 ,4 O. Metal clusters: 2 [K]. The MOF has largest included sphere 1.66 A, density 1.52 g/cm3, surface area 3795.12 m2/g, accessible volume 0.11 cm3/g