CoH8(C7O3)2 crystallizes in the trigonal P3_221 space group. Co(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Co(1)-O(1) bond lengths are 2.05 Å. Both Co(1)-O(3) bond lengths are 2.13 Å. There are seven inequivalent C sites. In the first C site, C(4) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(4)-C(4) bond length is 1.48 Å. The C(4)-C(6) bond length is 1.41 Å. The C(4)-C(7) bond length is 1.39 Å. In the second C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one C(6), and one H(4) atom. The C(5)-C(3) bond length is 1.39 Å. The C(5)-C(6) bond length is 1.38 Å. The C(5)-H(4) bond length is 0.95 Å. In the third C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(5), and one O(3) atom. The C(6)-O(3) bond length is 1.37 Å. In the fourth C site, C(7) is bonded in a distorted single-bond geometry to one C(1), one C(4), and one H(2) atom. The C(7)-C(1) bond length is 1.38 Å. The C(7)-H(2) bond length is 0.95 Å. In the fifth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(3), one C(7), and one H(1) atom. The C(1)-C(3) bond length is 1.39 Å. The C(1)-H(1) bond length is 0.95 Å. In the sixth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(2)-C(3) bond length is 1.50 Å. The C(2)-O(1) bond length is 1.24 Å. The C(2)-O(2) bond length is 1.29 Å. In the seventh C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(5) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(7) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(2) atom. The H(3)-O(2) bond length is 0.84 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. There are three 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(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one C(2) and one H(3) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Co(1) and one C(6) atom. Linkers: 1 [O]c1cc([C](O)O[Co]2(O[C](O)c3ccc(-c4ccc(C(=O)O)cc4[O])c([O])c3)Oc3cc(C(=O)O)ccc3-c3ccc(C(=O)O)cc3O2)ccc1-c1ccc(C(=O)O)cc1[O]. Metal clusters: 2 [O][Co]([O])(O[C]O)O[C]O. RCSR code: tsx. The MOF has largest included sphere 6.43 A, density 0.73 g/cm3, surface area 4298.22 m2/g, accessible volume 0.90 cm3/g