Co2C9H3O6Cl crystallizes in the cubic P2_13 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a tetrahedral geometry to three equivalent O(2) and one Cl(1) atom. All Co(1)-O(2) bond lengths are 1.94 Å. The Co(1)-Cl(1) bond length is 2.08 Å. In the second Co site, Co(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(1) atoms. All Co(2)-O(1) bond lengths are 1.96 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(1)-C(3) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.22 Å. The C(1)-O(2) bond length is 1.31 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(1) atom. There is one shorter (1.35 Å) and one longer (1.37 Å) C(2)-C(3) bond length. 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(1) and two equivalent C(2) atoms. H(1) is bonded in a single-bond geometry to one C(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Co(2) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. Cl(1) is bonded in a single-bond geometry to one Co(1) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 4 Cl[Co]12O[C]O[Co](O[C]O1)O[C]O2. RCSR code: srs. The MOF has largest included sphere 8.24 A, density 0.76 g/cm3, surface area 3393.75 m2/g, accessible volume 0.89 cm3/g