CsC6H2(NO3)3 crystallizes in the monoclinic Pc space group. Cs(1) is bonded in a 12-coordinate geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(3), three equivalent O(4), and three equivalent O(9) atoms. The Cs(1)-O(5) bond length is 3.26 Å. The Cs(1)-O(6) bond length is 3.34 Å. The Cs(1)-O(7) bond length is 3.35 Å. The Cs(1)-O(8) bond length is 3.27 Å. There is one shorter (3.20 Å) and one longer (3.21 Å) Cs(1)-O(3) bond length. There are a spread of Cs(1)-O(4) bond distances ranging from 3.34-3.62 Å. There are a spread of Cs(1)-O(9) bond distances ranging from 3.33-3.62 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one N(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.47 Å. The C(1)-N(1) bond length is 1.44 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one O(1) atom. The C(2)-C(3) bond length is 1.44 Å. The C(2)-O(1) bond length is 1.32 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(2) atom. The C(3)-C(4) bond length is 1.44 Å. The C(3)-N(2) bond length is 1.38 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 O(2) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-O(2) bond length is 1.32 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one N(3) atom. The C(5)-C(6) bond length is 1.47 Å. The C(5)-N(3) bond length is 1.44 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one O(3) atom. The C(6)-O(3) bond length is 1.25 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one O(4), and one O(5) atom. The N(1)-O(4) bond length is 1.25 Å. The N(1)-O(5) bond length is 1.25 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(3), one O(6), and one O(7) atom. The N(2)-O(6) bond length is 1.28 Å. The N(2)-O(7) bond length is 1.28 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(5), one O(8), and one O(9) atom. The N(3)-O(8) bond length is 1.25 Å. The N(3)-O(9) bond length is 1.25 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a bent 150 degrees geometry to one O(1) and one O(6) atom. The H(1)-O(1) bond length is 1.03 Å. The H(1)-O(6) bond length is 1.51 Å. In the second H site, H(2) is bonded in a bent 150 degrees geometry to one O(2) and one O(7) atom. The H(2)-O(2) bond length is 1.03 Å. The H(2)-O(7) bond length is 1.51 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one C(2) and one H(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one C(4) and one H(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent Cs(1) and one C(6) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to three equivalent Cs(1) and one N(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cs(1) and one N(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Cs(1), one N(2), and one H(1) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Cs(1), one N(2), and one H(2) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Cs(1) and one N(3) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to three equivalent Cs(1) and one N(3) atom. Linkers: 2 O=C1C([N+](=O)[O-])=C(O)[C]([N+](=O)[O-])C(O)=C1[N+](=O)[O-]. Metal clusters: 2 [Cs]. The MOF has largest included sphere 1.75 A, density 2.56 g/cm3, surface area 2791.40 m2/g, accessible volume 0.04 cm3/g