CoC9H7(N2O)2 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded in a distorted tetrahedral geometry to one N(1), one N(2), one N(3), and one O(1) atom. The Co(1)-N(1) bond length is 1.99 Å. The Co(1)-N(2) bond length is 1.96 Å. The Co(1)-N(3) bond length is 1.97 Å. The Co(1)-O(1) bond length is 1.97 Å. There are nine 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 1.30 Å. The C(1)-O(2) bond length is 1.27 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(7) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(7) 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(3) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(3) 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(4), and one C(5) atom. The C(4)-C(4) bond length is 1.49 Å. The C(4)-C(5) bond length is 1.41 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 H(4) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), one C(7), and one H(5) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-H(5) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one H(6) atom. The C(7)-H(6) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(7) atom. The C(8)-N(1) bond length is 1.32 Å. The C(8)-N(3) bond length is 1.36 Å. The C(8)-H(7) bond length is 1.08 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one N(2), one N(3), and one N(4) atom. The C(9)-N(2) bond length is 1.36 Å. The C(9)-N(3) bond length is 1.37 Å. The C(9)-N(4) bond length is 1.34 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Co(1), one C(8), and one N(2) atom. The N(1)-N(2) bond length is 1.40 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Co(1), one C(9), and one N(1) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Co(1), one C(8), and one C(9) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(9), one H(1), and one H(2) atom. The N(4)-H(1) bond length is 1.03 Å. The N(4)-H(2) bond length is 1.01 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(7) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(8) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Co(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: 2 [O]C(=O)c1cccc(-c2cccc(C([O])=O)c2)c1 ,2 NC1=[N]=CN=N1 ,1 NC1=NN=C[N]1 ,1 NC1=NC=N[N]1. Metal clusters: 2 O=[C]O[Co]1[N][N][Co](O[C]=O)[N][N]1. The MOF has largest included sphere 4.49 A, density 1.26 g/cm3, surface area 3852.60 m2/g, accessible volume 0.41 cm3/g