Cu3H4(C2N3)2 crystallizes in the tetragonal I4_1/acd space group. The structure consists of a Cu3H4(C2N3)2 framework. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a bent 150 degrees geometry to one N(1) and one N(2) atom. The Cu(1)-N(1) bond length is 1.88 Å. The Cu(1)-N(2) bond length is 1.89 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent N(3) atoms. Both Cu(2)-N(3) bond lengths are 1.87 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 1.30 Å. The C(1)-N(3) bond length is 1.33 Å. The C(1)-H(1) bond length is 0.95 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(2) atom. The C(2)-N(2) bond length is 1.30 Å. The C(2)-N(3) bond length is 1.37 Å. The C(2)-H(2) bond length is 0.95 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Cu(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.40 Å. In the second N site, N(2) is bonded in a 3-coordinate geometry to one Cu(1), one C(2), and one N(1) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Cu(2), one C(1), and one C(2) atom. 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: 25 C1=NN=C[N]1 ,4 [N]1=CN=NC=1 ,3 C1=NC=N[N]1. Metal clusters: 8 N1=N\[Cu]/N=N\[Cu]/N=N\[Cu]/N=N\[Cu]/1 ,16 [Cu]. The MOF has largest included sphere 8.61 A, density 1.62 g/cm3, surface area 2955.26 m2/g, accessible volume 0.39 cm3/g