KCN4H2O crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 10-coordinate geometry to one N(1), two equivalent N(2), two equivalent N(4), one H(1), one H(2), and three equivalent O(1) atoms. The K(1)-N(1) bond length is 3.20 Å. There is one shorter (2.96 Å) and one longer (2.97 Å) K(1)-N(2) bond length. There is one shorter (2.96 Å) and one longer (3.00 Å) K(1)-N(4) bond length. The K(1)-H(1) bond length is 2.93 Å. The K(1)-H(2) bond length is 2.73 Å. There are a spread of K(1)-O(1) bond distances ranging from 2.76-2.91 Å. C(1) is bonded in a distorted trigonal planar geometry to one C(1), one N(1), and one N(4) atom. The C(1)-C(1) bond length is 1.45 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(4) bond length is 1.35 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one K(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.34 Å. In the second N site, N(2) is bonded to two equivalent K(1), one N(1), and one N(3) atom to form corner-sharing NK2N2 tetrahedra. The N(2)-N(3) bond length is 1.32 Å. In the third N site, N(3) is bonded in a 3-coordinate geometry to one N(2), one N(4), and one H(1) atom. The N(3)-N(4) bond length is 1.34 Å. The N(3)-H(1) bond length is 1.78 Å. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to two equivalent K(1), one C(1), and one N(3) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1), one N(3), and one O(1) atom. The H(1)-O(1) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(1) atom. The H(2)-O(1) bond length is 1.00 Å. O(1) is bonded in a water-like geometry to three equivalent K(1), one H(1), and one H(2) atom. Linkers: 2 [N]1N=NN=C1C1=NN=N[N]1. Metal clusters: 4 [K]. The MOF has largest included sphere 0.91 A, density 1.95 g/cm3, surface area 1272.44 m2/g, accessible volume 0.02 cm3/g