CuC10H6(NO)4 crystallizes in the trigonal R-3 space group. Cu(1) is bonded in a square co-planar geometry to two equivalent N(1) and two equivalent O(1) atoms. Both Cu(1)-N(1) bond lengths are 2.00 Å. Both Cu(1)-O(1) bond lengths are 1.93 Å. There are five inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(1) bond length is 1.51 Å. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(5) bond length is 1.37 Å. In the second C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(2), and one H(1) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(1) bond length is 0.92 Å. In the third C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(2) atom. The C(4)-N(1) bond length is 1.34 Å. The C(4)-N(2) bond length is 1.33 Å. The C(4)-H(2) bond length is 0.94 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(3) atom. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(3) bond length is 0.95 Å. In the fifth 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)-O(1) bond length is 1.28 Å. The C(1)-O(2) 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 Cu(1), one C(4), and one C(5) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one C(3) and one C(4) atom. There are three 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. Linkers: 1 [CH].[CH].[CH].[CH].[CH]N=[CH].[C].[C].[C].[C].[C].[C].[C].[C]=O.[C]=O.[C]N=[C].[C][N].[Cu].[Cu].[H].[H].[H].[H].[N].[N].[N].[N][Cu](OC(=O)c1cncnc1)(OC(=O)c1cncnc1)N1[CH]C(C(=O)O[Cu][O])=CN=C1.[O].[O].[O].[O].[O].[c]1cncnc1 ,1 O=[C]O[Cu].O=[C]O[Cu].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH][N].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C]=O.[C]=O.[C]=O.[C]=O.[C]=O.[C]N=[CH].[C]N=[CH].[C]N=[C].[C]N=[C].[C]N=[C].[C]N=[C].[C]O[Cu][N].[C][C][O].[C][N].[C][N].[C][N][Cu].[Cu].[Cu].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O][C]=O ,1 [CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH].[CH][N].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C].[C]=O.[C]=O.[C]=O.[C]=O.[C]=O.[C]=[C][C]O[Cu][O].[C]N=[CH].[C]N=[CH].[C][C]O[Cu][O].[C][N].[Cu].[Cu].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[H].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N].[N]/C=[C]\[C]=N\[Cu].[N]/[C]=[C]/C([O])=O.[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O][C]=O ,1 [CH].[C].[C].[C]=O.[N][Cu](OC(=O)c1cncnc1)(OC(=O)c1cncnc1)N1[CH][C]=CN=C1.[O].[O].[O]C(=O)C1=CN([Cu])[CH]N=C1.[O]C(=O)c1cncnc1.[O][Cu].[c]1cncnc1. Metal clusters: 1 O=[C]O[Cu]O[C]=O. The MOF has largest included sphere 6.60 A, density 1.49 g/cm3, surface area 3948.62 m2/g, accessible volume 0.25 cm3/g