LaH6(C2O3)3 crystallizes in the orthorhombic Pnnm space group. La(1) is bonded in a 9-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. The La(1)-O(3) bond length is 2.39 Å. The La(1)-O(4) bond length is 2.40 Å. The La(1)-O(5) bond length is 2.58 Å. Both La(1)-O(1) bond lengths are 2.68 Å. Both La(1)-O(2) bond lengths are 2.68 Å. Both La(1)-O(6) bond lengths are 2.53 Å. There are four inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. The C(2)-C(4) bond length is 1.51 Å. Both C(2)-C(1) bond lengths are 1.40 Å. In the second C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(3)-C(1) bond length is 1.50 Å. The C(3)-O(1) bond length is 1.29 Å. The C(3)-O(2) bond length is 1.27 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.27 Å. The C(4)-O(4) bond length is 1.25 Å. In the fourth C site, C(1) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(3) atom. The C(1)-C(1) bond length is 1.40 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.99 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to one La(1) and one C(4) atom. In the second O site, O(4) is bonded in a distorted linear geometry to one La(1) and one C(4) atom. In the third O site, O(5) is bonded in a water-like geometry to one La(1) and two equivalent H(1) atoms. In the fourth O site, O(2) is bonded in a single-bond geometry to one La(1) and one C(3) atom. In the fifth O site, O(6) is bonded in a distorted water-like geometry to one La(1), one H(2), and one H(3) atom. In the sixth O site, O(1) is bonded in a single-bond geometry to one La(1) and one C(3) atom. Linkers: 2 [O]C(=O)c1c(C([O])=O)c(C([O])=O)c(C([O])=O)c(C([O])=O)c1C([O])=O. Metal clusters: 4 [La]. The MOF has largest included sphere 2.83 A, density 2.48 g/cm3, surface area 2419.08 m2/g, accessible volume 0.08 cm3/g