ZnC3H3(N2O)2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded in a trigonal bipyramidal geometry to one N(1), one N(2), one N(3), one O(1), and one O(2) atom. The Zn(1)-N(1) bond length is 2.01 Å. The Zn(1)-N(2) bond length is 2.01 Å. The Zn(1)-N(3) bond length is 2.12 Å. The Zn(1)-O(1) bond length is 2.07 Å. The Zn(1)-O(2) bond length is 2.26 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(1) atom. The C(2)-N(1) bond length is 1.35 Å. The C(2)-N(2) bond length is 1.32 Å. The C(2)-H(1) bond length is 1.08 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(1), one N(3), and one N(4) atom. The C(3)-N(1) bond length is 1.37 Å. The C(3)-N(3) bond length is 1.35 Å. The C(3)-N(4) bond length is 1.36 Å. There are four inequivalent N sites. In the first N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(2), and one N(3) atom. The N(2)-N(3) bond length is 1.39 Å. In the second N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(3), and one N(2) atom. In the third N site, N(4) is bonded in a distorted trigonal planar geometry to one C(3), one H(2), and one H(3) atom. The N(4)-H(2) bond length is 1.02 Å. The N(4)-H(3) bond length is 1.01 Å. In the fourth N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(2), and one C(3) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Zn(1) and one C(1) atom. Linkers: 1 [O]C(=O)C([O])=O ,4 NC1=[N]=CN=N1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 3.38 A, density 1.74 g/cm3, surface area 3362.26 m2/g, accessible volume 0.23 cm3/g