CuC2N3H2 crystallizes in the orthorhombic Ima2 space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent N(1) and two equivalent N(2) atoms. Both Cu(1)-N(1) bond lengths are 2.01 Å. Both Cu(1)-N(2) bond lengths are 1.97 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to one N(3) and one N(4) atom. The Cu(2)-N(3) bond length is 1.85 Å. The Cu(2)-N(4) bond length is 1.83 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(3), and one H(1) atom. The C(1)-N(1) bond length is 1.32 Å. The C(1)-N(3) bond length is 1.37 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(4), and one H(2) atom. The C(2)-N(2) bond length is 1.33 Å. The C(2)-N(4) bond length is 1.34 Å. The C(2)-H(2) bond length is 0.93 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cu(1), one C(1), and one N(1) atom. The N(1)-N(1) bond length is 1.34 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cu(1), one C(2), and one N(2) atom. The N(2)-N(2) bond length is 1.41 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one Cu(2) and two equivalent C(1) atoms. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Cu(2) and two equivalent C(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. Linkers: 4 C1=NC=N[N]1 ,4 C1=NN=C[N]1. Metal clusters: 8 [Cu]. The MOF has largest included sphere 7.09 A, density 1.10 g/cm3, surface area 3046.42 m2/g, accessible volume 0.62 cm3/g