CoC8H4O4 crystallizes in the tetragonal I4_1/a space group. The structure consists of thirty-two 02329_fluka molecules inside a CoC7H3O4 framework. In the CoC7H3O4 framework, there are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(3), one O(5), one O(7), and one O(8) atom to form a mixture of distorted edge and corner-sharing CoO5 square pyramids. The corner-sharing octahedral tilt angles are 74°. The Co(1)-O(1) bond length is 1.98 Å. The Co(1)-O(3) bond length is 2.02 Å. The Co(1)-O(5) bond length is 2.14 Å. The Co(1)-O(7) bond length is 2.26 Å. The Co(1)-O(8) bond length is 2.14 Å. In the second Co site, Co(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of edge and corner-sharing CoO6 octahedra. The Co(2)-O(2) bond length is 2.04 Å. The Co(2)-O(4) bond length is 2.02 Å. The Co(2)-O(5) bond length is 2.21 Å. The Co(2)-O(6) bond length is 2.00 Å. The Co(2)-O(7) bond length is 2.32 Å. The Co(2)-O(8) bond length is 2.15 Å. There are fourteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-C(7) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-H(3) bond length is 0.93 Å. In the fifth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.38 Å. The C(6)-C(8) bond length is 1.50 Å. In the sixth C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(4) atom. The C(7)-H(4) bond length is 0.93 Å. In the seventh C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.26 Å. The C(8)-O(4) bond length is 1.25 Å. In the eighth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(5), and one O(6) atom. The C(9)-C(10) bond length is 1.50 Å. The C(9)-O(5) bond length is 1.28 Å. The C(9)-O(6) bond length is 1.25 Å. In the ninth 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 1.39 Å. The C(10)-C(15) bond length is 1.39 Å. In the tenth C site, C(11) is bonded in a distorted single-bond geometry to one C(10) and one H(5) atom. The C(11)-H(5) bond length is 0.93 Å. In the eleventh C site, C(13) is bonded in a distorted single-bond geometry to one C(14) and one H(7) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-H(7) bond length is 0.93 Å. In the twelfth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(16) atom. The C(14)-C(15) bond length is 1.38 Å. The C(14)-C(16) bond length is 1.49 Å. In the thirteenth C site, C(15) is bonded in a single-bond geometry to one C(10), one C(14), and one H(8) atom. The C(15)-H(8) bond length is 0.93 Å. In the fourteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(7), and one O(8) atom. The C(16)-O(7) bond length is 1.25 Å. The C(16)-O(8) bond length is 1.28 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the sixth H site, H(8) is bonded in a single-bond geometry to one C(15) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(2) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Co(2) and one C(8) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one C(9) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Co(2) and one C(9) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one C(16) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one C(16) atom. Linkers: 16 [O]C(=O)c1cccc(C([O])=O)c1. Metal clusters: 16 [Co]. The MOF has largest included sphere 6.46 A, density 1.13 g/cm3, surface area 3189.75 m2/g, accessible volume 0.50 cm3/g