MnH4(C2O5)2(N(CH3)2)2 crystallizes in the tetragonal P-42_1c space group. The structure consists of four dimethylazanium molecules inside a MnH4(C2O5)2 framework. In the MnH4(C2O5)2 framework, Mn(1) is bonded in an octahedral geometry to two equivalent O(3) and four equivalent O(1) atoms. Both Mn(1)-O(3) bond lengths are 2.13 Å. All Mn(1)-O(1) bond lengths are 2.17 Å. 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 1.27 Å. The C(1)-O(2) bond length is 1.27 Å. H(4) is bonded in a distorted single-bond geometry to one O(2) and one O(3) atom. The H(4)-O(2) bond length is 1.66 Å. The H(4)-O(3) bond length is 1.00 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted water-like geometry to one Mn(1) and two equivalent H(4) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(1) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(1) and one H(4) atom. Linkers: 2 [O]C(=O)C[NH2]CC(=O)[O]. Metal clusters: 2 O.O.O=[C]O[Mn](O[C]=O)(O[C]=O)O[C]=O. The MOF has largest included sphere 1.84 A, density 1.91 g/cm3, surface area 3773.09 m2/g, accessible volume 0.06 cm3/g