CuC4N3H6 crystallizes in the tetragonal I-42d space group. Cu(1) is bonded in a trigonal planar geometry to one N(2) and two equivalent N(1) atoms. The Cu(1)-N(2) bond length is 2.05 Å. Both Cu(1)-N(1) bond lengths are 1.94 Å. There are two inequivalent C sites. In the first C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one H(1), one H(2), and one H(3) atom. The C(2)-C(1) bond length is 1.48 Å. The C(2)-H(1) bond length is 1.10 Å. The C(2)-H(2) bond length is 1.10 Å. The C(2)-H(3) bond length is 1.10 Å. In the second C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one N(2) atom. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(2) bond length is 1.36 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a distorted trigonal planar geometry to one Cu(1) and two equivalent C(1) atoms. In the second N site, N(1) is bonded in a 3-coordinate geometry to one Cu(1), one C(1), and one N(1) atom. The N(1)-N(1) bond length is 1.38 Å. 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 C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. Linkers: 2 CC1=NN=C(C)[N]1 ,2 CC1=[N]=C(N=N1)C. Metal clusters: 4 [Cu]. The MOF has largest included sphere 1.97 A, density 2.10 g/cm3, surface area 3587.52 m2/g, accessible volume 0.08 cm3/g