Co3C9N12H4SO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a rectangular see-saw-like geometry to one N(2), one N(6), one O(1), and one O(2) atom. The Co(1)-N(2) bond length is 2.09 Å. The Co(1)-N(6) bond length is 2.11 Å. The Co(1)-O(1) bond length is 2.16 Å. The Co(1)-O(2) bond length is 2.09 Å. In the second Co site, Co(2) is bonded to two equivalent N(1), one O(2), one O(4), and two equivalent O(3) atoms to form CoN2O4 octahedra that share corners with two equivalent Co(2)N2O4 octahedra,  a cornercorner with one S(1)O4 tetrahedra, and  an edgeedge with one S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. Both Co(2)-N(1) bond lengths are 2.07 Å. The Co(2)-O(2) bond length is 2.08 Å. The Co(2)-O(4) bond length is 2.35 Å. There is one shorter (2.04 Å) and one longer (2.07 Å) Co(2)-O(3) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(3), and one N(4) atom. The C(1)-C(2) bond length is 1.47 Å. The C(1)-N(3) bond length is 1.34 Å. The C(1)-N(4) bond length is 1.34 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(4) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(1) atom. The C(3)-C(5) bond length is 1.39 Å. The C(3)-H(1) bond length is 0.95 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(3) atom. The C(4)-H(3) bond length is 0.95 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(3) atoms. The C(5)-C(6) bond length is 1.48 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5) and two equivalent N(5) atoms. Both C(6)-N(5) bond lengths are 1.33 Å. There are six inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Co(2), one N(2), and one N(3) atom. The N(1)-N(2) bond length is 1.32 Å. The N(1)-N(3) bond length is 1.33 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Co(1), one N(1), and one N(4) atom. The N(2)-N(4) bond length is 1.34 Å. In the third N site, N(3) is bonded in a distorted water-like geometry to one C(1) and one N(1) atom. In the fourth N site, N(4) is bonded in a distorted water-like geometry to one C(1) and one N(2) atom. In the fifth N site, N(5) is bonded in a distorted water-like geometry to one C(6) and one N(6) atom. The N(5)-N(6) bond length is 1.33 Å. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Co(1), one N(5), and one N(6) atom. The N(6)-N(6) bond length is 1.32 Å. 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 O(2) atom. The H(2)-O(2) bond length is 0.86 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. S(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form SO4 tetrahedra that share  a cornercorner with one Co(2)N2O4 octahedra and  an edgeedge with one Co(2)N2O4 octahedra. The corner-sharing octahedral tilt angles are 49°. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.46 Å. Both S(1)-O(1) bond lengths are 1.47 Å. 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 S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Co(2), two equivalent Co(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Co(2) and one S(1) atom. Linkers: 4 c1c(C2=NN=N[N]2)cc(C2=NN=N[N]2)cc1C1=NN=N[N]1. Metal clusters: 12 [Co]. The MOF has largest included sphere 4.24 A, density 1.71 g/cm3, surface area 2976.39 m2/g, accessible volume 0.18 cm3/g