LaH3(CO2)4(CH2)2 crystallizes in the monoclinic C2/c space group. The structure consists of sixteen 02329_fluka molecules inside a LaH3(CO2)4 framework. In the LaH3(CO2)4 framework, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(8), two equivalent O(4), and two equivalent O(5) atoms. The La(1)-O(1) bond length is 2.53 Å. The La(1)-O(2) bond length is 2.54 Å. The La(1)-O(3) bond length is 2.61 Å. The La(1)-O(6) bond length is 2.43 Å. The La(1)-O(8) bond length is 2.45 Å. There is one shorter (2.55 Å) and one longer (2.69 Å) La(1)-O(4) bond length. There is one shorter (2.51 Å) and one longer (2.74 Å) La(1)-O(5) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one O(3) atom. The C(2)-O(3) bond length is 1.43 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(4)-O(4) bond length is 1.28 Å. The C(4)-O(5) bond length is 1.27 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(7) atom. The C(6)-O(6) bond length is 1.27 Å. The C(6)-O(7) bond length is 1.27 Å. There are three inequivalent H sites. In the first H site, H(7) is bonded in a distorted linear geometry to one O(7) and one O(8) atom. The H(7)-O(7) bond length is 1.64 Å. The H(7)-O(8) bond length is 1.01 Å. In the second H site, H(5) is bonded in a distorted single-bond geometry to one O(2) and one O(3) atom. The H(5)-O(2) bond length is 1.64 Å. The H(5)-O(3) bond length is 1.01 Å. In the third H site, H(6) is bonded in a distorted single-bond geometry to one O(7) and one O(8) atom. The H(6)-O(7) bond length is 1.65 Å. The H(6)-O(8) bond length is 1.00 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent La(1) and one C(4) atom. In the second O site, O(6) is bonded in a distorted bent 150 degrees geometry to one La(1) and one C(6) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one C(6), one H(6), and one H(7) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one La(1), one C(2), and one H(5) atom. In the fifth O site, O(8) is bonded in a distorted water-like geometry to one La(1), one H(6), and one H(7) atom. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to one La(1) and one C(1) atom. In the seventh O site, O(4) is bonded in a distorted single-bond geometry to two equivalent La(1) and one C(4) atom. In the eighth O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one C(1), and one H(5) atom. Linkers: 4 [O]C(=O)CC(O)(CC([O])=O)C([O])=O. Metal clusters: 4 [La]. The MOF has largest included sphere 2.11 A, density 2.59 g/cm3, surface area 2373.97 m2/g, accessible volume 0.07 cm3/g