MgH8(CO4)2(CH2)2 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 one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. The Mg(1)-O(1) bond length is 2.09 Å. The Mg(1)-O(3) bond length is 2.10 Å. The Mg(1)-O(5) bond length is 2.14 Å. The Mg(1)-O(6) bond length is 2.08 Å. The Mg(1)-O(7) bond length is 2.09 Å. The Mg(1)-O(8) bond length is 2.06 Å. There are two 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 1.29 Å. The C(1)-O(2) bond length is 1.27 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.28 Å. The C(4)-O(4) bond length is 1.28 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) and one O(5) atom. The H(1)-O(4) bond length is 1.68 Å. The H(1)-O(5) bond length is 1.01 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(2) and one O(5) atom. The H(2)-O(2) bond length is 1.65 Å. The H(2)-O(5) bond length is 1.01 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(4) and one O(6) atom. The H(3)-O(4) bond length is 1.66 Å. The H(3)-O(6) bond length is 1.01 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(1) and one O(6) atom. The H(4)-O(1) bond length is 1.66 Å. The H(4)-O(6) bond length is 1.01 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. The H(5)-O(7) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(7) atom. The H(6)-O(7) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(8) atom. The H(7)-O(8) bond length is 0.99 Å. In the eighth H site, H(8) is bonded in a distorted single-bond geometry to one O(2) and one O(8) atom. The H(8)-O(2) bond length is 1.68 Å. The H(8)-O(8) bond length is 1.00 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one C(1), and one H(4) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one H(2), and one H(8) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Mg(1) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one C(4), one H(1), and one H(3) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Mg(1), one H(1), and one H(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Mg(1), one H(3), and one H(4) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Mg(1), one H(5), and one H(6) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Mg(1), one H(7), and one H(8) atom. Linkers: 4 [O]C(=O)CCC([O])=O. Metal clusters: 4 O.O.O.O.[Mg].[O][C]=O.[O][C]=O. The MOF has largest included sphere 1.64 A, density 1.75 g/cm3, surface area 3928.62 m2/g, accessible volume 0.08 cm3/g