CoC12H6(NO2)2 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded in a distorted square pyramidal geometry to one N(1), one O(1), one O(2), one O(3), and one O(4) atom. The Co(1)-N(1) bond length is 2.17 Å. The Co(1)-O(1) bond length is 2.01 Å. The Co(1)-O(2) bond length is 2.02 Å. The Co(1)-O(3) bond length is 2.05 Å. The Co(1)-O(4) bond length is 2.03 Å. There are twelve inequivalent C sites. In the first 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 1.49 Å. The C(1)-O(1) bond length is 1.28 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(8) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(8) bond length is 1.40 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 1.40 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(6) atom. The C(4)-C(5) bond length is 1.49 Å. The C(4)-C(6) bond length is 1.40 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.28 Å. The C(5)-O(4) bond length is 1.28 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(7), and one H(2) atom. The C(6)-C(7) bond length is 1.40 Å. The C(6)-H(2) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(6), one C(8), and one C(9) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-C(9) bond length is 1.48 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(2), one C(7), and one H(3) atom. The C(8)-H(3) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(7) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-C(12) bond length is 1.40 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(9), one N(2), and one H(4) atom. The C(10)-N(2) bond length is 1.34 Å. The C(10)-H(4) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(5) atom. The C(11)-N(1) bond length is 1.35 Å. The C(11)-N(2) bond length is 1.33 Å. The C(11)-H(5) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(9), one N(1), and one H(6) atom. The C(12)-N(1) bond length is 1.34 Å. The C(12)-H(6) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(11), and one C(12) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one C(10) and one C(11) atom. 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(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(11) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(12) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Co(1) and one C(5) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(-c2cncnc2)c1. Metal clusters: 2 [C]1O[Co]234O[C]O[Co]2(O1)(O[C]O3)O[C]O4. RCSR code: sql. The MOF has largest included sphere 4.22 A, density 1.18 g/cm3, surface area 3963.12 m2/g, accessible volume 0.46 cm3/g