MgC9H8(NO3)2 crystallizes in the monoclinic Cc space group. Mg(1) is bonded in an octahedral geometry to one N(1), one O(1), one O(3), one O(4), one O(5), and one O(6) atom. The Mg(1)-N(1) bond length is 2.18 Å. The Mg(1)-O(1) bond length is 2.08 Å. The Mg(1)-O(3) bond length is 2.14 Å. The Mg(1)-O(4) bond length is 2.14 Å. The Mg(1)-O(5) bond length is 2.06 Å. The Mg(1)-O(6) bond length is 2.08 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(3) bond length is 1.28 Å. The C(1)-O(4) bond length is 1.28 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(7) bond length is 1.42 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(2) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one N(2) atom. The C(4)-C(5) bond length is 1.42 Å. The C(4)-N(2) bond length is 1.39 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one N(1) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-N(1) bond length is 1.39 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(3) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-H(3) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(8) atom. The C(7)-C(8) bond length is 1.50 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(1), and one O(2) atom. The C(8)-O(1) bond length is 1.27 Å. The C(8)-O(2) bond length is 1.27 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(4) atom. The C(9)-N(1) bond length is 1.33 Å. The C(9)-N(2) bond length is 1.36 Å. The C(9)-H(4) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Mg(1), one C(5), and one C(9) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4), one C(9), and one H(1) atom. The N(2)-H(1) bond length is 1.02 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(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(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(9) atom. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(2) and one O(5) atom. The H(5)-O(2) bond length is 1.65 Å. The H(5)-O(5) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(3) and one O(5) atom. The H(6)-O(3) bond length is 1.73 Å. The H(6)-O(5) bond length is 1.00 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(6) atom. The H(7)-O(6) bond length is 0.98 Å. In the eighth H site, H(8) is bonded in a distorted single-bond geometry to one O(2) and one O(6) atom. The H(8)-O(2) bond length is 1.64 Å. The H(8)-O(6) bond length is 1.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Mg(1) and one C(8) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one C(8), one H(5), and one H(8) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one C(1), and one H(6) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Mg(1), one H(5), and one H(6) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one H(7), and one H(8) atom. Linkers: 2 [O]C(=O)c1cc2nc[nH]c2cc1C([O])=O. Metal clusters: 2 [Mg]. The MOF has largest included sphere 1.92 A, density 1.73 g/cm3, surface area 3932.44 m2/g, accessible volume 0.12 cm3/g