UCoC6O7 crystallizes in the triclinic P-1 space group. U(1) is bonded in a pentagonal planar geometry to one O(2), one O(3), one O(5), and two equivalent O(7) atoms. The U(1)-O(2) bond length is 2.37 Å. The U(1)-O(3) bond length is 2.39 Å. The U(1)-O(5) bond length is 2.37 Å. There is one shorter (2.30 Å) and one longer (2.32 Å) U(1)-O(7) bond length. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both Co(1)-O(1) bond lengths are 2.11 Å. In the second Co site, Co(2) is bonded in a linear geometry to two equivalent O(4) atoms. Both Co(2)-O(4) bond lengths are 2.10 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(5) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-C(3) bond length is 1.40 Å. The C(1)-C(5) bond length is 1.40 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(2)-O(1) bond length is 1.25 Å. The C(2)-O(2) bond length is 1.25 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), 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 1.26 Å. The C(4)-O(4) bond length is 1.24 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(5)-C(6) bond length is 1.51 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(6)-O(5) bond length is 1.26 Å. The C(6)-O(6) bond length is 1.22 Å. There are seven 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(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one U(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one U(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one U(1) and one C(6) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(6) atom. In the seventh O site, O(7) is bonded in a water-like geometry to two equivalent U(1) atoms. Linkers: 1 [O]C(=O)c1c(C([O])=O)c(C([O])=O)c(C([O])=O)c(C([O])=O)c1C([O])=O. Metal clusters: 2 [U] ,2 [Co]. The MOF has largest included sphere 4.00 A, density 2.36 g/cm3, surface area 2026.22 m2/g, accessible volume 0.18 cm3/g