Co3C18H6O13 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(12), one O(13), one O(5), and one O(7) atom to form edge-sharing CoO5 square pyramids. The Co(1)-O(10) bond length is 2.05 Å. The Co(1)-O(12) bond length is 2.17 Å. The Co(1)-O(13) bond length is 2.08 Å. The Co(1)-O(5) bond length is 2.11 Å. The Co(1)-O(7) bond length is 2.06 Å. In the second Co site, Co(2) is bonded to one O(1), one O(13), one O(4), one O(5), and one O(8) atom to form a mixture of edge and corner-sharing CoO5 square pyramids. The Co(2)-O(1) bond length is 2.04 Å. The Co(2)-O(13) bond length is 2.04 Å. The Co(2)-O(4) bond length is 2.07 Å. The Co(2)-O(5) bond length is 2.11 Å. The Co(2)-O(8) bond length is 2.15 Å. In the third Co site, Co(3) is bonded to one O(12), one O(13), one O(2), one O(6), and one O(9) atom to form a mixture of edge and corner-sharing CoO5 square pyramids. The Co(3)-O(12) bond length is 2.24 Å. The Co(3)-O(13) bond length is 2.03 Å. The Co(3)-O(2) bond length is 2.04 Å. The Co(3)-O(6) bond length is 2.11 Å. The Co(3)-O(9) bond length is 2.13 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.41 Å. The C(1)-C(7) bond length is 1.51 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 1.38 Å. The C(2)-C(8) bond length is 1.52 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 0.93 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(9) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-C(9) bond length is 1.51 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(5)-H(2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1) and one H(3) atom. The C(6)-H(3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(11), and one O(12) atom. The C(7)-O(11) bond length is 1.25 Å. The C(7)-O(12) bond length is 1.28 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(10), and one O(9) atom. The C(8)-O(10) bond length is 1.26 Å. The C(8)-O(9) bond length is 1.24 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(7), and one O(8) atom. The C(9)-O(7) bond length is 1.27 Å. The C(9)-O(8) bond length is 1.24 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(16) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-C(15) bond length is 1.40 Å. The C(10)-C(16) bond length is 1.51 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(17) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-C(17) bond length is 1.53 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11), one C(13), and one H(4) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-H(4) bond length is 0.93 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(12), one C(14), and one C(18) atom. The C(13)-C(14) bond length is 1.38 Å. The C(13)-C(18) bond length is 1.50 Å. In the fourteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(13) and one H(5) atom. The C(14)-H(5) bond length is 0.93 Å. In the fifteenth C site, C(15) is bonded in a single-bond geometry to one C(10) and one H(6) atom. The C(15)-H(6) bond length is 0.93 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(5), and one O(6) atom. The C(16)-O(5) bond length is 1.27 Å. The C(16)-O(6) bond length is 1.25 Å. In the seventeenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(11), one O(3), and one O(4) atom. The C(17)-O(3) bond length is 1.25 Å. The C(17)-O(4) bond length is 1.26 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(1), and one O(2) atom. The C(18)-O(1) bond length is 1.25 Å. The C(18)-O(2) bond length is 1.27 Å. 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(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(12) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(14) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(15) atom. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Co(2) and one C(18) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Co(3) and one C(18) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(17) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(17) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one C(16) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Co(3) and one C(16) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Co(1) and one C(9) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Co(2) and one C(9) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Co(3) and one C(8) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Co(1) and one C(8) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one C(7) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Co(1), one Co(3), and one C(7) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Co(3) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)c(C([O])=O)c1. Metal clusters: 6 [Co]. The MOF has largest included sphere 4.22 A, density 1.66 g/cm3, surface area 3126.06 m2/g, accessible volume 0.24 cm3/g