Co2C17H5O10 crystallizes in the trigonal P31c space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(4), one O(7), one O(8), and one O(9) atom. The Co(1)-O(1) bond length is 2.02 Å. The Co(1)-O(10) bond length is 2.51 Å. The Co(1)-O(4) bond length is 1.99 Å. The Co(1)-O(7) bond length is 2.26 Å. The Co(1)-O(8) bond length is 2.10 Å. The Co(1)-O(9) bond length is 2.01 Å. In the second Co site, Co(2) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), one O(6), and one O(8) atom. The Co(2)-O(2) bond length is 2.10 Å. The Co(2)-O(3) bond length is 2.04 Å. The Co(2)-O(6) bond length is 2.04 Å. The Co(2)-O(8) bond length is 2.20 Å. There are seventeen 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 1.38 Å. The C(1)-C(6) bond length is 1.38 Å. The C(1)-C(7) bond length is 1.51 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.42 Å. The C(2)-H(1) bond length is 0.93 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(8) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-C(8) 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 1.40 Å. The C(4)-H(2) bond length is 0.93 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(9) atom. The C(5)-C(6) bond length is 1.37 Å. The C(5)-C(9) bond length is 1.51 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 0.93 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.26 Å. The C(7)-O(2) bond length is 1.24 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.25 Å. The C(8)-O(4) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(5) atom. The C(9)-C(10) bond length is 1.38 Å. The C(9)-C(14) bond length is 1.41 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(9) atom. The C(10)-C(11) bond length is 1.42 Å. The C(10)-C(15) bond length is 1.48 Å. In the eleventh C site, C(11) is bonded in a 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 0.93 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(16) atom. The C(12)-C(13) bond length is 1.40 Å. The C(12)-C(16) bond length is 1.47 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 0.93 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(17), and one C(9) atom. The C(14)-C(17) bond length is 1.50 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(5), and one O(6) atom. The C(15)-O(5) bond length is 1.28 Å. The C(15)-O(6) bond length is 1.27 Å. In the sixteenth C site, C(16) is bonded in a bent 120 degrees geometry to one C(12), one O(7), and one O(8) atom. The C(16)-O(7) bond length is 1.24 Å. The C(16)-O(8) bond length is 1.27 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(10), and one O(9) atom. The C(17)-O(10) bond length is 1.22 Å. The C(17)-O(9) bond length is 1.28 Å. There are five 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. There are ten 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 bent 150 degrees geometry to one Co(2) and one C(7) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(8) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Co(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(15) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(15) atom. In the seventh O site, O(7) is bonded in a distorted L-shaped geometry to one Co(1) and one C(16) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one C(16) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Co(1) and one C(17) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Co(1) and one C(17) atom. Linkers: 6 [O]C(=O)c1cc(C([O])=O)cc(-c2c(C([O])=O)cc(C([O])=O)cc2C([O])=O)c1. Metal clusters: 6 O=[C]O[Co]1O[C]O[Co]2(O[C]=O)(O[C]O1)O[C]O2. The MOF has largest included sphere 7.80 A, density 1.23 g/cm3, surface area 3572.26 m2/g, accessible volume 0.45 cm3/g