Co8C27N18H9O17 crystallizes in the orthorhombic Pbcn space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one N(3), one N(4), one N(7), one O(1), and one O(9) atom to form CoN3O2 square pyramids that share  a cornercorner with one Co(2)N3O3 octahedra and  a cornercorner with one Co(1)N3O2 square pyramid. The corner-sharing octahedral tilt angles are 70°. The Co(1)-N(3) bond length is 2.09 Å. The Co(1)-N(4) bond length is 2.20 Å. The Co(1)-N(7) bond length is 2.11 Å. The Co(1)-O(1) bond length is 2.07 Å. The Co(1)-O(9) bond length is 2.15 Å. In the second Co site, Co(2) is bonded to one N(2), one N(5), one N(7), one O(2), one O(7), and one O(8) atom to form CoN3O3 octahedra that share  a cornercorner with one Co(1)N3O2 square pyramid and  a cornercorner with one Co(3)NO4 square pyramid. The Co(2)-N(2) bond length is 2.04 Å. The Co(2)-N(5) bond length is 2.09 Å. The Co(2)-N(7) bond length is 2.06 Å. The Co(2)-O(2) bond length is 2.01 Å. The Co(2)-O(7) bond length is 2.06 Å. The Co(2)-O(8) bond length is 2.17 Å. In the third Co site, Co(3) is bonded to one N(1), one O(4), one O(5), one O(6), and one O(7) atom to form distorted corner-sharing CoNO4 square pyramids. The corner-sharing octahedral tilt angles are 63°. The Co(3)-N(1) bond length is 2.17 Å. The Co(3)-O(4) bond length is 1.99 Å. The Co(3)-O(5) bond length is 2.16 Å. The Co(3)-O(6) bond length is 2.18 Å. The Co(3)-O(7) bond length is 2.09 Å. In the fourth Co site, Co(4) is bonded in a rectangular see-saw-like geometry to one N(6), one O(3), one O(7), and one O(8) atom. The Co(4)-N(6) bond length is 2.18 Å. The Co(4)-O(3) bond length is 1.94 Å. The Co(4)-O(7) bond length is 2.27 Å. The Co(4)-O(8) bond length is 2.09 Å. There are fifteen inequivalent C sites. In the first C site, C(13) is bonded in a distorted trigonal planar geometry to one C(14) and two equivalent N(5) atoms. The C(13)-C(14) bond length is 1.50 Å. Both C(13)-N(5) bond lengths are 1.35 Å. In the second C site, C(14) is bonded in a trigonal planar geometry to one C(13) and two equivalent C(10) atoms. Both C(14)-C(10) bond lengths are 1.37 Å. In the third C site, C(15) is bonded in a distorted single-bond geometry to two equivalent C(11) and one H(5) atom. Both C(15)-C(11) bond lengths are 1.38 Å. The C(15)-H(5) bond length is 0.93 Å. In the fourth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one N(4) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(4) bond length is 1.31 Å. In the fifth 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 1.37 Å. The C(2)-C(7) bond length is 1.40 Å. In the sixth 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 1.41 Å. The C(3)-H(1) bond length is 0.93 Å. In the seventh C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-C(8) bond length is 1.51 Å. In the eighth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.37 Å. The C(5)-H(2) bond length is 0.93 Å. In the ninth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(9) atom. The C(6)-C(7) bond length is 1.43 Å. The C(6)-C(9) bond length is 1.51 Å. In the tenth C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 0.93 Å. In the eleventh C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(1), and one O(2) atom. The C(8)-O(1) bond length is 1.27 Å. The C(8)-O(2) bond length is 1.26 Å. In the twelfth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(9)-O(3) bond length is 1.26 Å. The C(9)-O(4) bond length is 1.21 Å. In the thirteenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(14), and one H(4) atom. The C(10)-C(11) bond length is 1.41 Å. The C(10)-H(4) bond length is 0.93 Å. In the fourteenth C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(15) atom. The C(11)-C(12) bond length is 1.51 Å. In the fifteenth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(5), and one O(6) atom. The C(12)-O(5) bond length is 1.21 Å. The C(12)-O(6) bond length is 1.29 Å. There are nine inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Co(3), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.37 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Co(2), one N(1), and one N(3) atom. The N(2)-N(3) bond length is 1.30 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Co(1), one N(2), and one N(4) atom. The N(3)-N(4) bond length is 1.34 Å. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one Co(1), one C(1), and one N(3) atom. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one Co(2), one C(13), and one N(6) atom. The N(5)-N(6) bond length is 1.34 Å. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Co(4), one N(5), and one N(6) atom. The N(6)-N(6) bond length is 1.30 Å. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one Co(1), one Co(2), and one N(8) atom. The N(7)-N(8) bond length is 1.17 Å. In the eighth N site, N(8) is bonded in a linear geometry to one N(7) and one N(9) atom. The N(8)-N(9) bond length is 1.19 Å. In the ninth N site, N(9) is bonded in a single-bond geometry to one N(8) atom. There are five 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(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) 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(15) atom. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a water-like geometry to two equivalent Co(1) atoms. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(8) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(8) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Co(4) and one C(9) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(3) and one C(9) atom. In the sixth O site, O(5) is bonded in a distorted single-bond geometry to one Co(3) and one C(12) atom. In the seventh O site, O(6) is bonded in a distorted L-shaped geometry to one Co(3) and one C(12) atom. In the eighth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Co(2), one Co(3), and one Co(4) atom. In the ninth O site, O(8) is bonded in an L-shaped geometry to one Co(2) and one Co(4) atom. Linkers: 12 [O]C(=O)c1cc(C([O])=O)cc(C2=NN=N[N]2)c1. Metal clusters: 32 [Co]. The MOF has largest included sphere 4.34 A, density 1.74 g/cm3, surface area 2764.99 m2/g, accessible volume 0.25 cm3/g