KC7H3(NO3)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form distorted edge-sharing KO8 hexagonal bipyramids. The K(1)-O(3) bond length is 3.05 Å. The K(1)-O(4) bond length is 3.04 Å. The K(1)-O(5) bond length is 3.03 Å. The K(1)-O(6) bond length is 3.02 Å. There is one shorter (2.63 Å) and one longer (2.82 Å) K(1)-O(1) bond length. There is one shorter (2.64 Å) and one longer (2.82 Å) K(1)-O(2) bond length. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.27 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2); one C(5); and one H(1,2) atom. The C(3)-C(5) bond length is 1.40 Å. The C(3)-H(1,2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2); one C(6); and one H(1,2) atom. The C(4)-C(6) bond length is 1.39 Å. The C(4)-H(1,2) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one C(7), and one N(1) atom. The C(5)-C(7) bond length is 1.39 Å. The C(5)-N(1) bond length is 1.47 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(4), one C(7), and one N(2) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-N(2) bond length is 1.47 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(5), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(5), one O(3), and one O(5) atom. The N(1)-O(3) bond length is 1.24 Å. The N(1)-O(5) bond length is 1.24 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(6), one O(4), and one O(6) atom. The N(2)-O(4) bond length is 1.24 Å. The N(2)-O(6) bond length is 1.24 Å. There are two inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(7) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a single-bond geometry to one K(1) and one N(1) atom. In the second O site, O(6) is bonded in a single-bond geometry to one K(1) and one N(2) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the fifth O site, O(3) is bonded in a single-bond geometry to one K(1) and one N(1) atom. In the sixth O site, O(4) is bonded in a single-bond geometry to one K(1) and one N(2) atom. Linkers: 2 [O]C(=O)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1. Metal clusters: 2 [K]. The MOF has largest included sphere 1.46 A, density 1.80 g/cm3, surface area 3093.75 m2/g, accessible volume 0.08 cm3/g