KC7NHO4Cl crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 6-coordinate geometry to two equivalent N(1), one O(3), one O(4), and two equivalent O(1) atoms. There is one shorter (2.98 Å) and one longer (3.00 Å) K(1)-N(1) bond length. The K(1)-O(3) bond length is 2.70 Å. The K(1)-O(4) bond length is 2.87 Å. There is one shorter (2.79 Å) and one longer (2.80 Å) K(1)-O(1) bond length. There are seven inequivalent C sites. In the first C site, C(7) is bonded in a distorted linear geometry to one C(5) and one N(1) atom. The C(7)-C(5) bond length is 1.41 Å. The C(7)-N(1) bond length is 1.17 Å. In the second C site, C(1) is bonded in a distorted single-bond geometry to one C(2) and one O(1) atom. The C(1)-C(2) bond length is 1.44 Å. The C(1)-O(1) bond length is 1.24 Å. In the third C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one Cl(1) atom. The C(2)-C(3) bond length is 1.37 Å. The C(2)-Cl(1) bond length is 1.72 Å. In the fourth C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one O(2) atom. The C(3)-O(2) bond length is 1.31 Å. In the fifth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one O(3) atom. The C(4)-C(5) bond length is 1.44 Å. The C(4)-O(3) bond length is 1.25 Å. In the sixth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.42 Å. In the seventh C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one O(4) atom. The C(6)-O(4) bond length is 1.26 Å. N(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(7) atom. H(1) is bonded in a distorted bent 150 degrees geometry to one O(2) and one O(4) atom. The H(1)-O(2) bond length is 1.03 Å. The H(1)-O(4) bond length is 1.60 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 K(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one C(3) and one H(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one C(6), and one H(1) atom. Cl(1) is bonded in a single-bond geometry to one C(2) atom. Linkers: 4 N#C[C]1C(=O)C(=O)C(Cl)=C(O)C1=O. Metal clusters: 4 [K]. The MOF has largest included sphere 1.46 A, density 1.92 g/cm3, surface area 2088.95 m2/g, accessible volume 0.03 cm3/g