ThH4(C2O5)2 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a distorted q6 geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Both Th(1)-O(1) bond lengths are 2.48 Å. Both Th(1)-O(2) bond lengths are 2.50 Å. Both Th(1)-O(3) bond lengths are 2.61 Å. Both Th(1)-O(4) bond lengths are 2.49 Å. Both Th(1)-O(5) bond lengths are 2.53 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(1)-O(3) bond length is 1.27 Å. The C(1)-O(5) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(4) atom. The C(2)-O(1) bond length is 1.26 Å. The C(2)-O(4) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.98 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Th(1) and one C(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Th(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Th(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Th(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Th(1) and one C(1) atom. Linkers: 2 [O]C(=O)C([O])=O. Metal clusters: 2 [Th]. The MOF has largest included sphere 2.55 A, density 3.29 g/cm3, surface area 1760.56 m2/g, accessible volume 0.07 cm3/g