MgC20H12(NO2)2 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in an octahedral geometry to two equivalent N(1), two equivalent O(1), and two equivalent O(2) atoms. Both Mg(1)-N(1) bond lengths are 2.30 Å. Both Mg(1)-O(1) bond lengths are 2.04 Å. Both Mg(1)-O(2) bond lengths are 2.03 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one N(1) atom. The C(1)-C(1) bond length is 1.45 Å. The C(1)-C(5) bond length is 1.42 Å. The C(1)-N(1) bond length is 1.36 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(1) atom. The C(2)-N(1) bond length is 1.33 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(4), and one C(6) atom. The C(5)-C(6) bond length is 1.43 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(6)-H(4) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(10), one C(8), and one C(9) atom. The C(7)-C(10) bond length is 1.40 Å. The C(7)-C(8) bond length is 1.40 Å. The C(7)-C(9) bond length is 1.51 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(10), one C(7), and one H(5) atom. The C(8)-C(10) bond length is 1.39 Å. The C(8)-H(5) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(1), and one O(2) atom. The C(9)-O(1) bond length is 1.26 Å. The C(9)-O(2) bond length is 1.27 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(7), one C(8), and one H(6) atom. The C(10)-H(6) bond length is 1.09 Å. N(1) is bonded in a trigonal planar geometry to one Mg(1), one C(1), and one C(2) atom. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(8) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(10) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(9) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(9) atom. Linkers: 2 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 2 [Mg]. The MOF has largest included sphere 1.99 A, density 1.51 g/cm3, surface area 4325.41 m2/g, accessible volume 0.15 cm3/g