CoH3(C3O2)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(12), one O(3), and one O(7) atom to form distorted corner-sharing CoO5 square pyramids. The Co(1)-O(1) bond length is 2.03 Å. The Co(1)-O(11) bond length is 2.25 Å. The Co(1)-O(12) bond length is 2.17 Å. The Co(1)-O(3) bond length is 2.05 Å. The Co(1)-O(7) bond length is 2.04 Å. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(4), one O(8), and one O(9) atom to form distorted corner-sharing CoO5 square pyramids. The Co(2)-O(10) bond length is 2.23 Å. The Co(2)-O(12) bond length is 2.05 Å. The Co(2)-O(4) bond length is 2.03 Å. The Co(2)-O(8) bond length is 2.06 Å. The Co(2)-O(9) bond length is 2.14 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 1.39 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.51 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) bond length is 1.04 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(9) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-C(9) bond length is 1.51 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(2) bond length is 0.83 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-C(8) bond length is 1.50 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(6)-H(3) bond length is 0.98 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.25 Å. The C(7)-O(2) bond length is 1.23 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.24 Å. The C(8)-O(6) 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(3), 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 1.26 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 1.38 Å. The C(10)-C(16) bond length is 1.51 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(4) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-H(4) bond length is 0.94 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(17) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-C(17) bond length is 1.49 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(12), one C(14), and one H(5) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-H(5) bond length is 0.95 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(18) atom. The C(14)-C(15) bond length is 1.40 Å. The C(14)-C(18) bond length is 1.49 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(10), one C(14), and one H(6) atom. The C(15)-H(6) bond length is 0.96 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(7), and one O(8) atom. The C(16)-O(7) bond length is 1.26 Å. The C(16)-O(8) bond length is 1.25 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(10), and one O(9) atom. The C(17)-O(10) bond length is 1.26 Å. The C(17)-O(9) bond length is 1.26 Å. In the eighteenth C site, C(18) is bonded in a bent 120 degrees geometry to one C(14), one O(11), and one O(12) atom. The C(18)-O(11) bond length is 1.24 Å. The C(18)-O(12) 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(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) 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(11) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(13) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(15) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(1) and one C(7) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(7) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(9) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(8) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Co(1) and one C(16) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Co(2) and one C(16) atom. In the ninth O site, O(9) is bonded in an L-shaped geometry to one Co(2) and one C(17) atom. In the tenth O site, O(10) is bonded in an L-shaped geometry to one Co(2) and one C(17) atom. In the eleventh O site, O(11) is bonded in an L-shaped geometry to one Co(1) and one C(18) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one C(18) atom. Linkers: 36 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 18 O=[C]O[Co]12O[C]O[Co]3(O[C]O1)(O[C]O2)O[C]O3. The MOF has largest included sphere 10.63 A, density 0.89 g/cm3, surface area 3797.41 m2/g, accessible volume 0.78 cm3/g