KC2H(NO)2 crystallizes in the orthorhombic Fdd2 space group. K(1) is bonded in a 7-coordinate geometry to two equivalent N(2), two equivalent O(1), and three equivalent O(2) atoms. There is one shorter (2.88 Å) and one longer (2.97 Å) K(1)-N(2) bond length. Both K(1)-O(1) bond lengths are 2.83 Å. There are a spread of K(1)-O(2) bond distances ranging from 2.74-2.92 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(1) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one N(2) atom. The C(2)-N(2) bond length is 1.18 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one O(1), and one O(2) atom. The N(1)-O(1) bond length is 1.29 Å. The N(1)-O(2) bond length is 1.28 Å. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(2) atom. H(1) is bonded in a single-bond geometry to one C(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent K(1) and one N(1) atom. Linkers: 4 N#C[CH][N+](=O)[O-]. Metal clusters: 4 [K]. The MOF has largest included sphere 1.93 A, density 1.70 g/cm3, surface area 1935.41 m2/g, accessible volume 0.05 cm3/g