MgH8(CO4)2(CH2)4 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a MgH8(CO4)2 framework. In the MgH8(CO4)2 framework, Mg(1) is bonded in an octahedral geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Mg(1)-O(2) bond lengths are 2.08 Å. Both Mg(1)-O(3) bond lengths are 2.07 Å. Both Mg(1)-O(4) bond lengths are 2.10 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 1.28 Å. There are four inequivalent H sites. In the first H site, H(5) is bonded in a single-bond geometry to one O(1) and one O(3) atom. The H(5)-O(1) bond length is 1.69 Å. The H(5)-O(3) bond length is 1.00 Å. In the second H site, H(6) is bonded in a single-bond geometry to one O(3) atom. The H(6)-O(3) bond length is 0.98 Å. In the third H site, H(7) is bonded in a distorted single-bond geometry to one O(1) and one O(4) atom. The H(7)-O(1) bond length is 1.68 Å. The H(7)-O(4) bond length is 1.00 Å. In the fourth H site, H(8) is bonded in a distorted single-bond geometry to one O(2) and one O(4) atom. The H(8)-O(2) bond length is 1.66 Å. The H(8)-O(4) bond length is 1.00 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted water-like geometry to one Mg(1), one H(7), and one H(8) atom. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one C(1), one H(5), and one H(7) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one C(1), and one H(8) atom. In the fourth O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one H(5), and one H(6) atom. Linkers: 2 [O]C(=O)CCCCC([O])=O. Metal clusters: 2 O.O.O.O.[Mg].[O][C]=O.[O][C]=O. The MOF has largest included sphere 1.96 A, density 1.51 g/cm3, surface area 4979.46 m2/g, accessible volume 0.17 cm3/g