CoH18(C2O)11 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(9) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 48°. Both Co(1)-O(1) bond lengths are 2.18 Å. Both Co(1)-O(11) bond lengths are 2.13 Å. Both Co(1)-O(9) bond lengths are 2.02 Å. In the second Co site, Co(2) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(2) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 48°. Both Co(2)-O(10) bond lengths are 2.02 Å. Both Co(2)-O(11) bond lengths are 2.13 Å. Both Co(2)-O(2) bond lengths are 2.16 Å. There are twenty-two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(1)-C(3) bond length is 1.51 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(4) atom. The C(2)-C(4) bond length is 1.50 Å. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.28 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(13), and one C(5) atom. The C(3)-C(13) bond length is 1.42 Å. The C(3)-C(5) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(14), one C(2), and one C(6) atom. The C(4)-C(14) bond length is 1.42 Å. The C(4)-C(6) bond length is 1.40 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one H(9) atom. The C(5)-C(7) bond length is 1.40 Å. The C(5)-H(9) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(8), and one H(10) atom. The C(6)-C(8) bond length is 1.40 Å. The C(6)-H(10) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(15), one C(5), and one C(9) atom. The C(7)-C(15) bond length is 1.49 Å. The C(7)-C(9) bond length is 1.40 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(16), and one C(6) atom. The C(8)-C(10) bond length is 1.40 Å. The C(8)-C(16) bond length is 1.48 Å. In the ninth C site, C(9) is bonded in a distorted trigonal planar geometry to one C(11), one C(7), and one H(11) atom. The C(9)-C(11) bond length is 1.39 Å. The C(9)-H(11) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(12), one C(8), and one H(12) atom. The C(10)-C(12) bond length is 1.39 Å. The C(10)-H(12) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(13); one C(9); and one H(13,14) atom. The C(11)-C(13) bond length is 1.41 Å. The C(11)-H(13,14) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(10); one C(14); and one H(13,14) atom. The C(12)-C(14) bond length is 1.41 Å. The C(12)-H(13,14) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(11), one C(17), and one C(3) atom. The C(13)-C(17) bond length is 1.48 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(12), one C(18), and one C(4) atom. The C(14)-C(18) bond length is 1.48 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(5), and one O(7) atom. The C(15)-O(5) bond length is 1.33 Å. The C(15)-O(7) bond length is 1.24 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(6), and one O(8) atom. The C(16)-O(6) bond length is 1.33 Å. The C(16)-O(8) bond length is 1.24 Å. In the seventeenth C site, C(17) is bonded in a trigonal planar geometry to one C(13), one C(19), and one C(21) atom. The C(17)-C(19) bond length is 1.40 Å. The C(17)-C(21) bond length is 1.40 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(14), one C(20), and one C(22) atom. The C(18)-C(20) bond length is 1.40 Å. The C(18)-C(22) bond length is 1.40 Å. In the nineteenth C site, C(19) is bonded in a distorted single-bond geometry to one C(17) and one H(15,16) atom. The C(19)-H(15,16) bond length is 1.09 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(18) and one H(15,16) atom. The C(20)-H(15,16) bond length is 1.09 Å. In the twenty-first C site, C(21) is bonded in a distorted single-bond geometry to one C(17) and one H(17,18) atom. The C(21)-H(17,18) bond length is 1.09 Å. In the twenty-second C site, C(22) is bonded in a distorted single-bond geometry to one C(18) and one H(17,18) atom. The C(22)-H(17,18) bond length is 1.09 Å. There are fifteen inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(3) and one O(5) atom. The H(1)-O(3) bond length is 1.66 Å. The H(1)-O(5) bond length is 1.02 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(6) atom. The H(2)-O(4) bond length is 1.65 Å. The H(2)-O(6) bond length is 1.02 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(8) and one O(9) atom. The H(3)-O(8) bond length is 1.64 Å. The H(3)-O(9) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(10) and one O(7) atom. The H(4)-O(10) bond length is 1.00 Å. The H(4)-O(7) bond length is 1.65 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(2) and one O(9) atom. The H(5)-O(2) bond length is 1.70 Å. The H(5)-O(9) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(1) and one O(10) atom. The H(6)-O(1) bond length is 1.70 Å. The H(6)-O(10) bond length is 1.00 Å. In the seventh H site, H(7) is bonded in a distorted linear geometry to one O(11) and one O(3) atom. The H(7)-O(11) bond length is 1.02 Å. The H(7)-O(3) bond length is 1.58 Å. In the eighth H site, H(8) is bonded in a distorted linear geometry to one O(11) and one O(4) atom. The H(8)-O(11) bond length is 1.02 Å. The H(8)-O(4) bond length is 1.58 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(5) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(6) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(9) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(10) atom. In the thirteenth H site, H(13,14) is bonded in a single-bond geometry to one C(11) atom. In the fourteenth H site, H(15,16) is bonded in a single-bond geometry to one C(19) atom. In the fifteenth H site, H(17,18) is bonded in a single-bond geometry to one C(21) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Co(1), one C(1), and one H(6) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Co(2), one C(2), and one H(5) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one C(1), one H(1), and one H(7) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one C(2), one H(2), and one H(8) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one C(15) and one H(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one C(16) and one H(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one C(15) and one H(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one C(16) and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one H(3), and one H(5) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one Co(2), one H(4), and one H(6) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Co(1), one Co(2), one H(7), and one H(8) atom. Linkers: 2 [O]C(=O)c1cc(C(=O)O)ccc1-c1ccc(-c2ccc(C(=O)O)cc2C([O])=O)cc1. Metal clusters: 2 [Co]. The MOF has largest included sphere 1.84 A, density 1.68 g/cm3, surface area 4053.82 m2/g, accessible volume 0.14 cm3/g