Cu(C6H4NO2)2 crystallizes in the trigonal P3_221 space group. Cu(1) is bonded in a square co-planar geometry to two equivalent N(1) and two equivalent O(2) atoms. Both Cu(1)-N(1) bond lengths are 2.03 Å. Both Cu(1)-O(2) bond lengths are 1.96 Å. There are six inequivalent C sites. In the first C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(4) atom. The C(6)-C(2) bond length is 1.40 Å. The C(6)-N(1) bond length is 1.32 Å. The C(6)-H(4) bond length is 0.93 Å. In the second 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)-C(2) bond length is 1.51 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.25 Å. In the third C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.35 Å. In the fourth C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. In the fifth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(2) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-H(2) bond length is 0.93 Å. In the sixth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(3) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(3) bond length is 0.93 Å. N(1) is bonded in a trigonal planar geometry to one Cu(1), one C(5), and one C(6) atom. There are four 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. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. Linkers: 2 [O]C(=O)C1=CN([Cu](OC(=O)c2cccnc2)(OC(=O)c2cccnc2)N2[CH]C=CC(C([O])=O)=C2)[CH][C]=C1 ,1 [O]C(=O)C1=CN([Cu](OC(=O)c2cccnc2)(OC(=O)c2cccnc2)N2[CH]C=CC(C([O])=O)=C2)[CH]C=C1 ,1 [O]C(=O)C1=CN([Cu](OC(=O)c2c[c]cnc2)(OC(=O)c2cccnc2)N2[CH]C=CC(C([O])=O)=C2)[CH]C=C1 ,2 [O]C(=O)c1cccnc1 ,1 [O]C(=O)C1=CC=CN([Cu@](OC(=O)c2c[c]cnc2)(OC(=O)c2cccnc2)N2[CH]C=CC(C([O])=O)=C2)[CH]1. Metal clusters: 2 O=[C]O[Cu]O[C]=O. The MOF has largest included sphere 5.00 A, density 1.27 g/cm3, surface area 4353.97 m2/g, accessible volume 0.36 cm3/g