Cd3C18H6(NO)8 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a rectangular see-saw-like geometry to one N(3), one O(1), one O(2), and one O(4) atom. The Cd(1)-N(3) bond length is 2.32 Å. The Cd(1)-O(1) bond length is 2.27 Å. The Cd(1)-O(2) bond length is 2.50 Å. The Cd(1)-O(4) bond length is 2.30 Å. In the second Cd site, Cd(2) is bonded in a bent 150 degrees geometry to two equivalent N(2) atoms. Both Cd(2)-N(2) bond lengths are 2.32 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(5), and one C(6) atom. The C(1)-C(2) bond length is 1.48 Å. The C(1)-C(5) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.39 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one N(3), and one N(4) atom. The C(2)-N(3) bond length is 1.34 Å. The C(2)-N(4) bond length is 1.33 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(5), one C(8), and one C(9) atom. The C(3)-C(5) bond length is 1.39 Å. The C(3)-C(8) bond length is 1.51 Å. The C(3)-C(9) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(6), one C(7), and one C(9) atom. The C(4)-C(6) bond length is 1.40 Å. The C(4)-C(7) bond length is 1.49 Å. The C(4)-C(9) bond length is 1.40 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(5)-H(1) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(4), and one H(2) atom. The C(6)-H(2) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(4) atom. The C(7)-O(2) bond length is 1.27 Å. The C(7)-O(4) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(8)-O(1) bond length is 1.26 Å. The C(8)-O(3) bond length is 1.26 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(3), one C(4), and one H(3) atom. The C(9)-H(3) bond length is 0.93 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a water-like geometry to one N(2) and one N(3) atom. The N(1)-N(2) bond length is 1.31 Å. The N(1)-N(3) bond length is 1.35 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(2), one N(1), and one N(4) atom. The N(2)-N(4) bond length is 1.35 Å. In the third N site, N(3) is bonded in a 3-coordinate geometry to one Cd(1), one C(2), and one N(1) atom. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to one C(2) and one N(2) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(9) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cd(1) and one C(8) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one Cd(1) and one C(7) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(8) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Cd(1) and one C(7) atom. 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Metal clusters: 4 O=[C]O[Cd]1O[C]O1 ,4 [Cd]. The MOF has largest included sphere 4.15 A, density 1.75 g/cm3, surface area 3311.00 m2/g, accessible volume 0.31 cm3/g