CoC5HO4 crystallizes in the monoclinic C2/c space group. Co(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Co(1)-O(1) bond length is 2.00 Å. The Co(1)-O(2) bond length is 1.95 Å. The Co(1)-O(3) bond length is 1.94 Å. The Co(1)-O(4) bond length is 1.92 Å. There are six inequivalent C sites. In the first C site, C(5) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(1) atom. Both C(5)-C(3) bond lengths are 1.40 Å. The C(5)-H(1) bond length is 1.09 Å. In the second C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(2) atom. Both C(6)-C(2) bond lengths are 1.40 Å. The C(6)-H(2) bond length is 1.09 Å. In the third 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 1.27 Å. The C(1)-O(2) bond length is 1.28 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.41 Å. In the fifth C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.49 Å. In the sixth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.27 Å. The C(4)-O(4) bond length is 1.28 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Co(1) and one C(4) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(4) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Co(1) and one C(1) atom. In the fourth O site, O(1) is bonded in a water-like geometry to one Co(1) and one C(1) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 [Co]. The MOF has largest included sphere 1.80 A, density 2.46 g/cm3, surface area 2521.04 m2/g, accessible volume 0.05 cm3/g