CoC5HO4 crystallizes in the orthorhombic Pbcn space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(4), one O(5), and one O(8) atom to form distorted corner-sharing CoO5 trigonal bipyramids. The Co(1)-O(1) bond length is 2.23 Å. The Co(1)-O(2) bond length is 2.16 Å. The Co(1)-O(4) bond length is 2.01 Å. The Co(1)-O(5) bond length is 2.00 Å. The Co(1)-O(8) bond length is 2.00 Å. In the second Co site, Co(2) is bonded to one O(2), one O(3), one O(6), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing CoO5 square pyramids. The Co(2)-O(2) bond length is 2.04 Å. The Co(2)-O(3) bond length is 2.06 Å. The Co(2)-O(6) bond length is 2.06 Å. There is one shorter (2.11 Å) and one longer (2.22 Å) Co(2)-O(7) bond length. There are ten 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 1.51 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(10), and one C(3) atom. The C(2)-C(10) bond length is 1.39 Å. The C(2)-C(3) bond length is 1.41 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(5) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-C(5) bond length is 1.39 Å. In the fourth 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 1.25 Å. The C(4)-O(4) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3), one C(6), and one H(1) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(1) bond length is 0.93 Å. In the sixth 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 1.51 Å. The C(6)-C(8) bond length is 1.39 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(5), and one O(6) atom. The C(7)-O(5) bond length is 1.25 Å. The C(7)-O(6) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(6), and one C(9) atom. The C(8)-C(10) bond length is 1.40 Å. The C(8)-C(9) bond length is 1.51 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(9)-O(7) bond length is 1.28 Å. The C(9)-O(8) bond length is 1.24 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(2), one C(8), and one H(2) atom. The C(10)-H(2) bond length is 0.93 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(10) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Co(2) and one C(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Co(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one C(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(7) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one C(9) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one C(9) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 16 [Co]. The MOF has largest included sphere 4.79 A, density 1.53 g/cm3, surface area 2728.87 m2/g, accessible volume 0.25 cm3/g