KCd2C11H8(NO2)5 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. Both K(1)-O(3) bond lengths are 2.73 Å. Both K(1)-O(5) bond lengths are 2.76 Å. There are two shorter (2.86 Å) and two longer (2.90 Å) K(1)-O(1) bond lengths. Cd(1) is bonded in a distorted octahedral geometry to one N(2), one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Cd(1)-N(2) bond length is 2.24 Å. The Cd(1)-O(1) bond length is 2.38 Å. The Cd(1)-O(2) bond length is 2.42 Å. The Cd(1)-O(3) bond length is 2.43 Å. The Cd(1)-O(4) bond length is 2.36 Å. The Cd(1)-O(5) bond length is 2.36 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(1)-C(5) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.29 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 N(3) and two equivalent N(2) atoms. The C(2)-N(3) bond length is 1.34 Å. Both C(2)-N(2) bond lengths are 1.35 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(6) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(5) bond length is 1.41 Å. The C(3)-C(6) bond length is 1.50 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 H(1) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(1) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(4) atom. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(6)-O(3) bond length is 1.26 Å. The C(6)-O(4) bond length is 1.28 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one N(1), one N(2), and one H(4) atom. The N(1)-N(1) bond length is 1.30 Å. The N(1)-N(2) bond length is 1.35 Å. The N(1)-H(4) bond length is 1.78 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(2), and one N(1) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(2) and two equivalent H(2) atoms. Both N(3)-H(2) bond lengths are 1.02 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(1) and one O(5) atom. The H(4)-O(5) bond length is 1.00 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), one Cd(1), and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cd(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one Cd(1), and one C(6) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(6) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one K(1), one Cd(1), one H(3), and one H(4) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O ,2 NC1=NN=N[N]1. Metal clusters: 2 [K] ,4 [Cd]. The MOF has largest included sphere 2.24 A, density 2.53 g/cm3, surface area 2025.90 m2/g, accessible volume 0.05 cm3/g