ThH8(C2O)8 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Th(1)-O(1) bond lengths are 2.46 Å. Both Th(1)-O(2) bond lengths are 2.38 Å. Both Th(1)-O(3) bond lengths are 2.45 Å. Both Th(1)-O(4) bond lengths are 2.36 Å. There are eight inequivalent C sites. In the first C site, C(8) is bonded in a distorted single-bond geometry to one C(5) and one H(3,4) atom. The C(8)-C(5) bond length is 1.40 Å. The C(8)-H(3,4) bond length is 1.09 Å. In the second C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(1)-C(2) bond length is 1.49 Å. The C(1)-O(3) bond length is 1.27 Å. The C(1)-O(4) bond length is 1.28 Å. In the third C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(6) bond length is 1.40 Å. In the fourth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one H(1) atom. The C(3)-C(6) bond length is 1.39 Å. The C(3)-H(1) bond length is 1.09 Å. In the fifth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(4)-C(5) bond length is 1.49 Å. The C(4)-O(1) bond length is 1.27 Å. The C(4)-O(2) bond length is 1.28 Å. In the sixth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(7), and one C(8) atom. The C(5)-C(7) bond length is 1.40 Å. In the seventh C site, C(6) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(2) atom. The C(6)-H(2) bond length is 1.09 Å. In the eighth C site, C(7) is bonded in a distorted single-bond geometry to one C(5) and one H(3,4) atom. The C(7)-H(3,4) bond length is 1.09 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3,4) is bonded in a single-bond geometry to one C(7) atom. There are four 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(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one C(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Th(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Th(1) and one C(1) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 2 [Th]. The MOF has largest included sphere 3.37 A, density 2.09 g/cm3, surface area 2695.17 m2/g, accessible volume 0.14 cm3/g