KC6H(NO2)4 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 10-coordinate geometry to one N(2), one O(1), one O(3), one O(7), two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms. The K(1)-N(2) bond length is 3.34 Å. The K(1)-O(1) bond length is 3.01 Å. The K(1)-O(3) bond length is 2.98 Å. The K(1)-O(7) bond length is 2.80 Å. There is one shorter (2.91 Å) and one longer (3.05 Å) K(1)-O(4) bond length. There is one shorter (2.89 Å) and one longer (2.99 Å) K(1)-O(6) bond length. Both K(1)-O(8) bond lengths are 2.86 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one N(3) atom. The C(1)-C(2) bond length is 1.44 Å. The C(1)-C(6) bond length is 1.43 Å. The C(1)-N(3) bond length is 1.38 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one O(3) atom. The C(2)-C(3) bond length is 1.42 Å. The C(2)-O(3) bond length is 1.32 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(4) atom. The C(3)-C(4) bond length is 1.45 Å. The C(3)-N(4) bond length is 1.43 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one O(4) atom. The C(4)-C(5) bond length is 1.47 Å. The C(4)-O(4) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one N(1) atom. The C(5)-C(6) bond length is 1.42 Å. The C(5)-N(1) bond length is 1.33 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one N(2) atom. The C(6)-N(2) bond length is 1.33 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one C(5), one O(1), and one O(2) atom. The N(1)-O(1) bond length is 1.22 Å. The N(1)-O(2) bond length is 1.53 Å. In the second N site, N(2) is bonded in a water-like geometry to one K(1), one C(6), and one O(2) atom. The N(2)-O(2) bond length is 1.36 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(1), one O(5), and one O(6) atom. The N(3)-O(5) bond length is 1.29 Å. The N(3)-O(6) bond length is 1.25 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(3), one O(7), and one O(8) atom. The N(4)-O(7) bond length is 1.24 Å. The N(4)-O(8) bond length is 1.25 Å. H(1) is bonded in a bent 150 degrees geometry to one O(3) and one O(5) atom. The H(1)-O(3) bond length is 1.04 Å. The H(1)-O(5) bond length is 1.48 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one K(1) and one N(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one N(1) and one N(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one K(1), one C(2), and one H(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to two equivalent K(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one N(3) and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1) and one N(4) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(4) atom. Linkers: 1 [O]N1ON=C2[C]1C(=O)C([N+](=O)[O-])=C(O)[C]2[N+](=O)[O-] ,1 [O]N1O[N]C2=C1C(=O)C([N+](=O)[O-])=C(O)[C]2[N+](=O)[O-]. Metal clusters: 2 [K]. The MOF has largest included sphere 1.36 A, density 2.10 g/cm3, surface area 2027.44 m2/g, accessible volume 0.02 cm3/g