MgC11H5O5 crystallizes in the cubic Im-3m space group. The structure consists of a MgC11H5O5 framework. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a square pyramidal geometry to one O(5), two equivalent O(1), and two equivalent O(3) atoms. The Mg(1)-O(5) bond length is 2.09 Å. Both Mg(1)-O(1) bond lengths are 2.06 Å. Both Mg(1)-O(3) bond lengths are 2.06 Å. In the second Mg site, Mg(2) is bonded in a see-saw-like geometry to one O(5), one O(6), and two equivalent O(2) atoms. The Mg(2)-O(5) bond length is 2.08 Å. The Mg(2)-O(6) bond length is 1.96 Å. Both Mg(2)-O(2) bond lengths are 2.24 Å. There are thirteen inequivalent C sites. In the first C site, C(12) is bonded in a distorted trigonal planar geometry to one C(12) and two equivalent C(8) atoms. The C(12)-C(12) bond length is 1.47 Å. Both C(12)-C(8) bond lengths are 1.44 Å. In the second C site, C(13) is bonded in a distorted single-bond geometry to two equivalent C(7) and one H(6) atom. Both C(13)-C(7) bond lengths are 1.40 Å. The C(13)-H(6) bond length is 0.95 Å. In the third C site, C(1) is bonded in a 4-coordinate geometry to one C(1), one H(1), one H(2), and one O(6) atom. The C(1)-C(1) bond length is 1.26 Å. The C(1)-H(1) bond length is 0.99 Å. The C(1)-H(2) bond length is 0.99 Å. The C(1)-O(6) bond length is 1.48 Å. In the fourth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(2)-C(3) bond length is 1.54 Å. The C(2)-O(1) bond length is 1.28 Å. The C(2)-O(2) bond length is 1.25 Å. In the fifth C site, C(3) is bonded in a trigonal planar geometry to one C(10), one C(2), and one C(4) atom. The C(3)-C(10) bond length is 1.41 Å. The C(3)-C(4) bond length is 1.42 Å. In the sixth C site, C(4) is bonded in a trigonal planar geometry to one C(11), one C(3), and one C(5) atom. The C(4)-C(11) bond length is 1.45 Å. The C(4)-C(5) bond length is 1.43 Å. In the seventh C site, C(5) is bonded in a single-bond geometry to one C(4) and one H(3) atom. The C(5)-H(3) bond length is 0.95 Å. In the eighth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(3), and one O(4) atom. The C(6)-C(7) bond length is 1.45 Å. The C(6)-O(3) bond length is 1.25 Å. The C(6)-O(4) bond length is 1.36 Å. In the ninth C site, C(7) is bonded in a trigonal planar geometry to one C(13), one C(6), and one C(8) atom. The C(7)-C(8) bond length is 1.38 Å. In the tenth C site, C(8) is bonded in a trigonal planar geometry to one C(12), one C(7), and one C(9) atom. The C(8)-C(9) bond length is 1.45 Å. In the eleventh C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(4) atom. The C(9)-H(4) bond length is 0.95 Å. In the twelfth C site, C(10) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(5) atom. The C(10)-H(5) bond length is 0.95 Å. In the thirteenth C site, C(11) is bonded in a trigonal planar geometry to one C(11) and two equivalent C(4) atoms. The C(11)-C(11) bond length is 1.39 Å. There are six inequivalent H sites. In the first H site, H(5) is bonded in a single-bond geometry to one C(10) atom. In the second H site, H(6) is bonded in a single-bond geometry to one C(13) atom. In the third H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the fifth H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(4) is bonded in a single-bond geometry to one C(9) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Mg(1) and one Mg(2) atom. In the second O site, O(6) is bonded in a trigonal planar geometry to one Mg(2) and two equivalent C(1) atoms. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one C(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mg(2) and one C(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one C(6) atom. In the sixth O site, O(4) is bonded in a single-bond geometry to one C(6) atom. Linkers: 12 C1COCCO1 ,24 [O]C(=O)c1cc(C([O])=O)c2ccc3c(C([O])=O)cc(C([O])=O)c4ccc1c2c43. Metal clusters: 24 [O][C]=O.[O][C]=O.[O][Mg]O[C]O[Mg]O[C]=O. The MOF has largest included sphere 20.18 A, density 0.88 g/cm3, surface area 4250.28 m2/g, accessible volume 0.71 cm3/g