MgC13NH8O5C4NH5 crystallizes in the monoclinic C2/c space group. The structure consists of eight cis-crotononitrile molecules inside a MgC13NH8O5 framework. In the MgC13NH8O5 framework, there are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles are 65°. Both Mg(1)-O(1) bond lengths are 2.17 Å. Both Mg(1)-O(2) bond lengths are 2.02 Å. Both Mg(1)-O(3) bond lengths are 2.03 Å. In the second Mg site, Mg(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles are 65°. Both Mg(2)-O(1) bond lengths are 2.19 Å. Both Mg(2)-O(4) bond lengths are 2.09 Å. Both Mg(2)-O(5) bond lengths are 2.08 Å. There are thirteen inequivalent C sites. In the first C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(4) atom. The C(5)-C(4) bond length is 1.38 Å. The C(5)-N(1) bond length is 1.36 Å. The C(5)-H(4) bond length is 1.09 Å. In the second C site, C(6) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(3) atom. The C(6)-C(10) bond length is 1.40 Å. The C(6)-C(11) bond length is 1.40 Å. The C(6)-C(3) bond length is 1.50 Å. In the third C site, C(7) is bonded in a distorted single-bond geometry to one C(8) and one H(8) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-H(8) bond length is 1.09 Å. In the fourth C site, C(8) is bonded in a trigonal planar geometry to one C(1), one C(7), and one C(9) atom. The C(8)-C(1) bond length is 1.50 Å. The C(8)-C(9) bond length is 1.40 Å. In the fifth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(6) atom. The C(9)-H(6) bond length is 1.09 Å. In the sixth C site, C(10) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(10)-H(3) bond length is 1.09 Å. In the seventh C site, C(11) is bonded in a distorted single-bond geometry to one C(6) and one H(7) atom. The C(11)-H(7) bond length is 1.09 Å. In the eighth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(13), one N(1), and one H(5) atom. The C(12)-C(13) bond length is 1.38 Å. The C(12)-N(1) bond length is 1.36 Å. The C(12)-H(5) bond length is 1.08 Å. In the ninth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(2), and one H(2) atom. The C(13)-C(2) bond length is 1.41 Å. The C(13)-H(2) bond length is 1.09 Å. In the tenth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(3), and one O(4) atom. The C(1)-O(3) bond length is 1.27 Å. The C(1)-O(4) bond length is 1.27 Å. In the eleventh C site, C(2) is bonded in a trigonal planar geometry to one C(13), one C(2), and one C(4) atom. The C(2)-C(2) bond length is 1.47 Å. The C(2)-C(4) bond length is 1.41 Å. In the twelfth C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(2), and one O(5) atom. The C(3)-O(2) bond length is 1.26 Å. The C(3)-O(5) bond length is 1.28 Å. In the thirteenth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(2), one C(5), and one H(1) atom. The C(4)-H(1) bond length is 1.09 Å. N(1) is bonded in a trigonal planar geometry to one C(12), one C(5), and one O(1) atom. The N(1)-O(1) bond length is 1.33 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(13) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(12) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(11) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(7) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one Mg(2), and one N(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mg(2) and one C(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mg(2) and one C(3) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)cc1 ,2 [O-][n+]1ccc(-c2cc[n+]([O-])cc2)cc1. Metal clusters: 4 [Mg]. The MOF has largest included sphere 2.28 A, density 1.41 g/cm3, surface area 4829.07 m2/g, accessible volume 0.13 cm3/g