CoH4(C3O2)3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a square co-planar geometry to one O(3), one O(5), and two equivalent O(11) atoms. The Co(1)-O(3) bond length is 2.03 Å. The Co(1)-O(5) bond length is 2.04 Å. Both Co(1)-O(11) bond lengths are 2.19 Å. In the second Co site, Co(2) is bonded in a square co-planar geometry to two equivalent O(12) and two equivalent O(8) atoms. Both Co(2)-O(12) bond lengths are 2.18 Å. Both Co(2)-O(8) bond lengths are 2.04 Å. In the third Co site, Co(3) is bonded in a square co-planar geometry to two equivalent O(10) and two equivalent O(12) atoms. Both Co(3)-O(10) bond lengths are 2.03 Å. Both Co(3)-O(12) bond lengths are 2.20 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(14), one C(15), and one C(2) atom. The C(1)-C(14) bond length is 1.40 Å. The C(1)-C(15) bond length is 1.51 Å. The C(1)-C(2) bond length is 1.39 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(1) atom. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(2) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(16), one C(3), and one C(5) atom. The C(4)-C(16) bond length is 1.51 Å. The C(4)-C(5) bond length is 1.40 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(14), one C(4), and one C(6) atom. The C(5)-C(14) bond length is 1.41 Å. The C(5)-C(6) bond length is 1.48 Å. In the sixth C site, C(6) is bonded in a single-bond geometry to one C(5), one C(7), and one O(1) atom. The C(6)-C(7) bond length is 1.49 Å. The C(6)-O(1) bond length is 1.22 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(12), one C(6), and one C(8) atom. The C(7)-C(12) bond length is 1.41 Å. The C(7)-C(8) bond length is 1.40 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(17), one C(7), and one C(9) atom. The C(8)-C(17) bond length is 1.51 Å. The C(8)-C(9) bond length is 1.39 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(3) atom. The C(9)-H(3) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11) and one H(4) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-H(4) bond length is 0.93 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(18) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-C(18) bond length is 1.51 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(7) atom. The C(12)-C(13) bond length is 1.49 Å. In the thirteenth C site, C(13) is bonded in a single-bond geometry to one C(12), one C(14), and one O(2) atom. The C(13)-C(14) bond length is 1.49 Å. The C(13)-O(2) bond length is 1.21 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(1), one C(13), and one C(5) atom. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(15)-O(3) bond length is 1.27 Å. The C(15)-O(4) 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(4), 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 1.24 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(17)-O(7) bond length is 1.24 Å. The C(17)-O(8) bond length is 1.28 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(10), and one O(9) atom. The C(18)-O(10) bond length is 1.28 Å. The C(18)-O(9) bond length is 1.23 Å. There are eight 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(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(9) 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 O(11) atom. The H(5)-O(11) bond length is 0.85 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(11) atom. The H(6)-O(11) bond length is 0.85 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(12) atom. The H(7)-O(12) bond length is 0.85 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(12) atom. The H(8)-O(12) bond length is 0.85 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(6) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(13) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(15) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(15) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(16) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(16) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(17) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(17) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one C(18) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Co(3) and one C(18) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to two equivalent Co(1), one H(5), and one H(6) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Co(2), one Co(3), one H(7), and one H(8) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)c2c1C(=O)c1c(C([O])=O)ccc(C([O])=O)c1C2=O. Metal clusters: 8 [Co]. The MOF has largest included sphere 4.51 A, density 1.31 g/cm3, surface area 3860.57 m2/g, accessible volume 0.39 cm3/g