Co3C10H6(N4O3)2 crystallizes in the tetragonal I4_1/a space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one N(1), one N(2), one O(1), one O(2), and two equivalent O(3) atoms to form edge-sharing CoN2O4 octahedra. The Co(1)-N(1) bond length is 2.09 Å. The Co(1)-N(2) bond length is 2.06 Å. The Co(1)-O(1) bond length is 2.06 Å. The Co(1)-O(2) bond length is 2.24 Å. There is one shorter (2.02 Å) and one longer (2.05 Å) Co(1)-O(3) bond length. In the second Co site, Co(2) is bonded to two equivalent N(3), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing CoN2O4 octahedra. Both Co(2)-N(3) bond lengths are 2.14 Å. Both Co(2)-O(1) bond lengths are 2.01 Å. Both Co(2)-O(2) bond lengths are 2.10 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(2), one N(4), and one O(2) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-N(4) bond length is 1.40 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one N(1) atom. The C(2)-N(1) bond length is 1.37 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(2) atom. The C(3)-N(1) bond length is 1.33 Å. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(2) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one N(2) and one N(3) atom. The C(4)-N(2) bond length is 1.34 Å. The C(4)-N(3) bond length is 1.37 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one N(3), one N(4), and one H(3) atom. The C(5)-N(3) bond length is 1.30 Å. The C(5)-N(4) bond length is 1.36 Å. The C(5)-H(3) bond length is 0.93 Å. There are four inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(3), and one C(4) atom. In the second N site, N(3) is bonded in a trigonal planar geometry to one Co(2), one C(4), and one C(5) atom. In the third N site, N(4) is bonded in a trigonal planar geometry to one C(1), one C(5), and one H(1) atom. The N(4)-H(1) bond length is 0.86 Å. In the fourth N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(2), and one C(3) atom. There are three 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 C(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are three inequivalent O sites. In the first O site, O(2) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one C(1) atom. In the second O site, O(3) is bonded in an L-shaped geometry to two equivalent Co(1) atoms. In the third O site, O(1) is bonded in a water-like geometry to one Co(1) and one Co(2) atom. Linkers: 4 O=C1NC=NC2=NC=N[C]12 ,1 O=C1N[CH]N=C2[N]C=N[C]12 ,1 O=c1[nH]cnc2=[N]=CN=c12 ,1 O=C1N[CH]N=C2N=CN=C12. Metal clusters: 12 [Co]. The MOF has largest included sphere 4.69 A, density 1.87 g/cm3, surface area 2351.71 m2/g, accessible volume 0.19 cm3/g