MgC16H6(NO4)2 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Mg(1)-O(1) bond lengths are 2.08 Å. Both Mg(1)-O(4) bond lengths are 2.11 Å. There are eight inequivalent C sites. In the first C site, C(5) is bonded in a distorted single-bond geometry to one C(2) and one N(1) atom. The C(5)-C(2) bond length is 1.39 Å. The C(5)-N(1) bond length is 1.43 Å. In the second C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(7) atom. The C(6)-C(1) bond length is 1.38 Å. The C(6)-C(2) bond length is 1.39 Å. The C(6)-C(7) bond length is 1.51 Å. In the third C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.23 Å. The C(7)-O(2) bond length is 1.28 Å. In the fourth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(8)-C(4) bond length is 1.50 Å. The C(8)-O(3) bond length is 1.27 Å. The C(8)-O(4) bond length is 1.24 Å. In the fifth C site, C(1) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(1) atom. The C(1)-C(4) bond length is 1.40 Å. The C(1)-H(1) bond length is 0.93 Å. In the sixth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(5), one C(6), and one H(2) atom. The C(2)-H(2) bond length is 0.93 Å. In the seventh C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(3) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-H(3) bond length is 0.93 Å. In the eighth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one C(8) atom. N(1) is bonded in a distorted bent 120 degrees geometry to one C(5) and one N(1) atom. The N(1)-N(1) bond length is 1.24 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. There are four 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(7) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(7) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(8) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Mg(1) and one C(8) atom. Linkers: 4 [O]C(=O)c1cc([N][N]c2cc(C([O])=O)cc(C([O])=O)c2)cc(C([O])=O)c1. Metal clusters: 4 O=[C]O[Mg]O[C]=O.[O][C]=O.[O][C]=O. RCSR code: pts. The MOF has largest included sphere 6.89 A, density 0.72 g/cm3, surface area 4454.46 m2/g, accessible volume 0.77 cm3/g