LiMnH4(C3O4)2 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form distorted LiO4 tetrahedra that share  an edgeedge with one Mn(1)O6 octahedra. The Li(1)-O(1) bond length is 1.97 Å. The Li(1)-O(3) bond length is 1.95 Å. The Li(1)-O(5) bond length is 2.05 Å. The Li(1)-O(8) bond length is 1.95 Å. Mn(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form MnO6 octahedra that share  an edgeedge with one Li(1)O4 tetrahedra. The Mn(1)-O(2) bond length is 2.13 Å. The Mn(1)-O(3) bond length is 2.28 Å. The Mn(1)-O(4) bond length is 2.17 Å. The Mn(1)-O(5) bond length is 2.18 Å. The Mn(1)-O(6) bond length is 2.14 Å. The Mn(1)-O(7) bond length is 2.19 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.51 Å. 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 trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(5) bond length is 1.41 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.52 Å. The C(3)-C(5) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), 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 1.27 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(6) atom. The C(5)-C(6) bond length is 1.50 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(6)-O(5) bond length is 1.28 Å. The C(6)-O(6) bond length is 1.26 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(8) atom. The H(3)-O(8) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. The H(4)-O(8) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Li(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), and one C(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), and one C(6) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(6) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Mn(1), one H(1), and one H(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Li(1), one H(3), and one H(4) 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 [Li] ,4 [Mn]. The MOF has largest included sphere 1.48 A, density 2.27 g/cm3, surface area 2151.56 m2/g, accessible volume 0.03 cm3/g