K2CdC16H6(NO6)2 crystallizes in the tetragonal P4_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 2-coordinate geometry to one K(2), one H(6), and one O(9) atom. The K(1)-K(2) bond length is 2.75 Å. The K(1)-H(6) bond length is 2.64 Å. The K(1)-O(9) bond length is 2.81 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to one K(1), one H(5), one O(10), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The K(2)-H(5) bond length is 2.94 Å. The K(2)-O(10) bond length is 2.65 Å. The K(2)-O(4) bond length is 2.80 Å. The K(2)-O(5) bond length is 3.26 Å. The K(2)-O(6) bond length is 2.98 Å. The K(2)-O(7) bond length is 2.63 Å. The K(2)-O(8) bond length is 2.60 Å. Cd(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(7), one O(8), and one O(9) atom. The Cd(1)-O(1) bond length is 2.56 Å. The Cd(1)-O(10) bond length is 2.29 Å. The Cd(1)-O(2) bond length is 2.31 Å. The Cd(1)-O(3) bond length is 2.59 Å. The Cd(1)-O(4) bond length is 2.34 Å. The Cd(1)-O(7) bond length is 2.49 Å. The Cd(1)-O(8) bond length is 2.39 Å. The Cd(1)-O(9) bond length is 2.66 Å. There are sixteen inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.21 Å. The C(1)-O(2) bond length is 1.28 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(7) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-C(7) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.36 Å. The C(3)-H(1) bond length is 0.96 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 N(1) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-N(1) bond length is 1.47 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 H(2) atom. The C(5)-C(6) bond length is 1.35 Å. The C(5)-H(2) bond length is 0.96 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.42 Å. The C(6)-C(8) bond length is 1.51 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 0.96 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.23 Å. The C(8)-O(4) bond length is 1.24 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(7), and one O(8) atom. The C(9)-C(10) bond length is 1.51 Å. The C(9)-O(7) bond length is 1.20 Å. The C(9)-O(8) bond length is 1.26 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(9) atom. The C(10)-C(11) bond length is 1.40 Å. The C(10)-C(15) bond length is 1.41 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(4) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-H(4) bond length is 0.96 Å. In the twelfth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(11), one C(13), and one N(2) atom. The C(12)-C(13) bond length is 1.41 Å. The C(12)-N(2) bond length is 1.41 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(12), one C(14), and one H(5) atom. The C(13)-C(14) bond length is 1.40 Å. The C(13)-H(5) bond length is 0.96 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(16) atom. The C(14)-C(15) bond length is 1.39 Å. The C(14)-C(16) bond length is 1.51 Å. In the fifteenth C site, C(15) is bonded in a single-bond geometry to one C(10), one C(14), and one H(6) atom. The C(15)-H(6) bond length is 0.91 Å. In the sixteenth C site, C(16) is bonded in a bent 120 degrees geometry to one C(14), one O(10), and one O(9) atom. The C(16)-O(10) bond length is 1.25 Å. The C(16)-O(9) bond length is 1.22 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(4), one O(5), and one O(6) atom. The N(1)-O(5) bond length is 1.24 Å. The N(1)-O(6) bond length is 1.18 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(12), one O(11), and one O(12) atom. The N(2)-O(11) bond length is 1.24 Å. The N(2)-O(12) bond length is 1.15 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one K(2) and one C(13) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one K(1) and one C(15) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like 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 Cd(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one Cd(1), and one C(8) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one K(2) and one N(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one K(2) and one N(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(2), one Cd(1), and one C(9) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one K(2), one Cd(1), and one C(9) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one Cd(1), and one C(16) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(2), one Cd(1), and one C(16) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one N(2) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one N(2) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc([N+](=O)[O-])c1. Metal clusters: 8 [K] ,4 [Cd]. The MOF has largest included sphere 4.07 A, density 1.60 g/cm3, surface area 3002.98 m2/g, accessible volume 0.16 cm3/g