KC8H7(NO2)4 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), one O(6), and one O(8) atom. The K(1)-O(2) bond length is 2.69 Å. The K(1)-O(4) bond length is 3.00 Å. The K(1)-O(5) bond length is 2.69 Å. The K(1)-O(6) bond length is 2.69 Å. The K(1)-O(8) bond length is 2.71 Å. There are eight 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 O(1) atom. The C(1)-N(1) bond length is 1.36 Å. The C(1)-O(1) bond length is 1.23 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one O(2) atom. The C(2)-N(1) bond length is 1.38 Å. The C(2)-N(2) bond length is 1.38 Å. The C(2)-O(2) bond length is 1.23 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(7), one N(2), and one O(3) atom. The C(3)-C(7) bond length is 1.55 Å. The C(3)-N(2) bond length is 1.37 Å. The C(3)-O(3) bond length is 1.24 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(8), one N(3), and one O(4) atom. The C(4)-C(8) bond length is 1.40 Å. The C(4)-N(3) bond length is 1.39 Å. The C(4)-O(4) bond length is 1.29 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one N(3), one N(4), and one O(5) atom. The C(5)-N(3) bond length is 1.37 Å. The C(5)-N(4) bond length is 1.37 Å. The C(5)-O(5) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(8), one N(4), and one O(6) atom. The C(6)-C(8) bond length is 1.41 Å. The C(6)-N(4) bond length is 1.39 Å. The C(6)-O(6) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(3), one C(8), and one O(7) atom. The C(7)-C(8) bond length is 1.50 Å. The C(7)-O(7) bond length is 1.44 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(2), and one H(1) atom. The N(1)-H(1) bond length is 1.05 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(2), one C(3), and one H(2) atom. The N(2)-H(2) bond length is 1.03 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(4), one C(5), and one H(3) atom. The N(3)-H(3) bond length is 1.04 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(5), one C(6), and one H(4) atom. The N(4)-H(4) bond length is 1.04 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one N(1) and one O(6) atom. The H(1)-O(6) bond length is 1.67 Å. In the second H site, H(2) is bonded in a single-bond geometry to one N(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(4) atom. In the fifth H site, H(5) is bonded in a distorted bent 150 degrees geometry to one O(4) and one O(7) atom. The H(5)-O(4) bond length is 1.59 Å. The H(5)-O(7) bond length is 1.02 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(8) atom. The H(6)-O(8) bond length is 0.98 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(8) atom. The H(7)-O(8) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one C(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one K(1), one C(4), and one H(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1) and one C(5) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one C(6), and one H(1) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one C(7) and one H(5) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one K(1), one H(6), and one H(7) atom. Linkers: 4 O=C1NC(=O)[C](C2(O)C(=O)NC(=O)NC2=O)C(=O)N1. Metal clusters: 4 [K]. The MOF has largest included sphere 1.51 A, density 1.88 g/cm3, surface area 2700.64 m2/g, accessible volume 0.05 cm3/g