Mg3C14H8(NO5)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form a mixture of edge and corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles are 59°. Both Mg(1)-O(1) bond lengths are 2.08 Å. Both Mg(1)-O(4) bond lengths are 2.05 Å. Both Mg(1)-O(5) bond lengths are 2.12 Å. In the second Mg site, Mg(2) is bonded to one N(1), one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form MgNO5 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  an edgeedge with one Mg(2)NO5 octahedra, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 59°. The Mg(2)-N(1) bond length is 2.26 Å. The Mg(2)-O(1) bond length is 2.14 Å. The Mg(2)-O(2) bond length is 2.06 Å. The Mg(2)-O(3) bond length is 2.09 Å. There is one shorter (2.08 Å) and one longer (2.09 Å) Mg(2)-O(5) bond length. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one N(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(6) bond length is 1.51 Å. The C(1)-N(1) bond length is 1.35 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(7) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(7) bond length is 1.51 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 1.39 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(1), and one H(4) atom. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.28 Å. The C(6)-O(2) bond length is 1.26 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.27 Å. The C(7)-O(4) bond length is 1.27 Å. N(1) is bonded in a trigonal planar geometry to one Mg(2), one C(1), and one C(5) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.97 Å. 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(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mg(2), and one C(6) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(2) and one C(6) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(2) and one C(7) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mg(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Mg(1), two equivalent Mg(2), and one H(1) atom. Linkers: 4 [O]C(=O)c1ccnc(C([O])=O)c1. Metal clusters: 6 [Mg]. The MOF has largest included sphere 6.19 A, density 1.18 g/cm3, surface area 3699.00 m2/g, accessible volume 0.42 cm3/g