Zn5C4H4(N9O2)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one N(1), one N(2), one N(6), one O(1), and one O(2) atom to form ZnN3O2 trigonal bipyramids that share  a cornercorner with one Zn(3)N4O2 octahedra and corners with two equivalent Zn(2)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 72°. The Zn(1)-N(1) bond length is 2.11 Å. The Zn(1)-N(2) bond length is 2.07 Å. The Zn(1)-N(6) bond length is 2.17 Å. The Zn(1)-O(1) bond length is 2.11 Å. The Zn(1)-O(2) bond length is 1.99 Å. In the second Zn site, Zn(2) is bonded to one N(5), one N(7), one N(8), one O(1), and one O(2) atom to form distorted ZnN3O2 trigonal bipyramids that share  a cornercorner with one Zn(3)N4O2 octahedra and corners with two equivalent Zn(1)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 71°. The Zn(2)-N(5) bond length is 2.04 Å. The Zn(2)-N(7) bond length is 2.52 Å. The Zn(2)-N(8) bond length is 2.02 Å. The Zn(2)-O(1) bond length is 2.10 Å. The Zn(2)-O(2) bond length is 1.94 Å. In the third Zn site, Zn(3) is bonded to two equivalent N(3), two equivalent N(9), and two equivalent O(1) atoms to form corner-sharing ZnN4O2 octahedra. Both Zn(3)-N(3) bond lengths are 2.15 Å. Both Zn(3)-N(9) bond lengths are 2.19 Å. Both Zn(3)-O(1) bond lengths are 2.10 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(5) atom. The C(1)-N(1) bond length is 1.36 Å. The C(1)-N(2) bond length is 1.36 Å. The C(1)-N(5) bond length is 1.36 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(6), and one N(9) atom. The C(2)-N(1) bond length is 1.37 Å. The C(2)-N(6) bond length is 1.36 Å. The C(2)-N(9) bond length is 1.36 Å. There are nine inequivalent N sites. In the first N site, N(4) is bonded in a water-like geometry to one N(3) and one N(5) atom. The N(4)-N(3) bond length is 1.30 Å. The N(4)-N(5) bond length is 1.35 Å. In the second N site, N(5) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(1), and one N(4) atom. In the third N site, N(6) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(2), and one N(7) atom. The N(6)-N(7) bond length is 1.33 Å. In the fourth N site, N(7) is bonded in a distorted trigonal non-coplanar geometry to one Zn(2), one N(6), and one N(8) atom. The N(7)-N(8) bond length is 1.30 Å. In the fifth N site, N(8) is bonded in a distorted trigonal planar geometry to one Zn(2), one N(7), and one N(9) atom. The N(8)-N(9) bond length is 1.35 Å. In the sixth N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(1), and one C(2) atom. In the seventh N site, N(9) is bonded in a 3-coordinate geometry to one Zn(3), one C(2), and one N(8) atom. In the eighth N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(1), and one N(3) atom. The N(2)-N(3) bond length is 1.35 Å. In the ninth N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(3), one N(2), and one N(4) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.98 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one H(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Zn(1), one Zn(2), one Zn(3), and one H(1) atom. Linkers: 3 N1=NN=[C](=N1)[N][C]1=NN=NN=1. Metal clusters: 10 [Zn]. The MOF has largest included sphere 3.22 A, density 2.54 g/cm3, surface area 2190.64 m2/g, accessible volume 0.13 cm3/g