Ni7C18H38(N3O10)2 crystallizes in the trigonal R-3 space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to six equivalent O(4) atoms to form edge-sharing NiO6 octahedra. All Ni(1)-O(4) bond lengths are 2.04 Å. In the second Ni site, Ni(2) is bonded to one N(1), one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form NiNO5 octahedra that share  an edgeedge with one Ni(1)O6 octahedra and edges with two equivalent Ni(2)NO5 octahedra. The Ni(2)-N(1) bond length is 2.07 Å. The Ni(2)-O(1) bond length is 2.09 Å. The Ni(2)-O(2) bond length is 2.10 Å. The Ni(2)-O(3) bond length is 2.09 Å. There is one shorter (2.03 Å) and one longer (2.08 Å) Ni(2)-O(4) bond length. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(2), and one H(3) atom. The C(1)-N(1) bond length is 1.48 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-H(3) bond length is 1.10 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(4), and one H(5) atom. The C(3)-N(1) bond length is 1.48 Å. The C(3)-H(4) bond length is 1.10 Å. The C(3)-H(5) bond length is 1.10 Å. N(1) is bonded in a 4-coordinate geometry to one Ni(2), one C(1), one C(3), and one H(1) atom. The N(1)-H(1) bond length is 1.03 Å. There are seven inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one O(3) atom. The H(6)-O(3) bond length is 0.97 Å. In the fifth H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one O(4) atom. The H(7)-O(4) bond length is 0.98 Å. In the seventh H site, H(2) is bonded in a single-bond geometry to one C(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Ni(2) and one C(2) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Ni(2) and one H(6) atom. In the third O site, O(2) is bonded in a water-like geometry to one Ni(2) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ni(1), two equivalent Ni(2), and one H(7) atom. Linkers: 3 C1CNCCN1 ,3 [O]C(=O)C([O])=O. Metal clusters: 7 [Ni]. The MOF has largest included sphere 1.90 A, density 2.24 g/cm3, surface area 3063.95 m2/g, accessible volume 0.11 cm3/g