UCuH2(CO)10 crystallizes in the triclinic P-1 space group. U(1) is bonded in a 2-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. Both U(1)-O(1) bond lengths are 2.34 Å. Both U(1)-O(4) bond lengths are 1.80 Å. Cu(1) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Cu(1)-O(2) bond lengths are 1.99 Å. Both Cu(1)-O(3) bond lengths are 1.95 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(3) bond length is 1.40 Å. The C(1)-H(1) bond length is 1.09 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(4) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(4) bond length is 1.49 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(5) atom. The C(3)-C(5) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(5) atom. The C(4)-O(2) bond length is 1.29 Å. The C(4)-O(5) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(5)-O(1) bond length is 1.27 Å. The C(5)-O(3) bond length is 1.28 Å. H(1) is bonded in a single-bond geometry to one C(1) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one U(1) and one C(5) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cu(1) and one C(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one U(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one C(4) atom. Linkers: 1 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 1 [U] ,1 [Cu]. RCSR code: scu. The MOF has largest included sphere 2.10 A, density 3.39 g/cm3, surface area 1739.23 m2/g, accessible volume 0.04 cm3/g