CuH8(C4N3)2 crystallizes in the cubic Pn-3n space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square pyramidal geometry to one Cu(2) and four equivalent N(1) atoms. The Cu(1)-Cu(2) bond length is 0.77 Å. All Cu(1)-N(1) bond lengths are 2.02 Å. In the second Cu site, Cu(2) is bonded in a distorted single-bond geometry to one Cu(1) and four equivalent N(1) atoms. All Cu(2)-N(1) bond lengths are 2.09 Å. There are four inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(3) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-N(2) bond length is 1.32 Å. The C(3)-H(3) bond length is 0.93 Å. In the second C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(4) atom. The C(4)-N(1) bond length is 1.31 Å. The C(4)-N(3) bond length is 1.28 Å. The C(4)-H(4) bond length is 0.93 Å. In the third C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one C(1); one N(2); and two equivalent H(1,2) atoms. The C(2)-C(1) bond length is 1.53 Å. The C(2)-N(2) bond length is 1.45 Å. Both C(2)-H(1,2) bond lengths are 0.97 Å. In the fourth C site, C(1) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(1) atoms. Both C(1)-C(1) bond lengths are 1.41 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(2), one C(3), and one C(4) atom. In the second N site, N(2) is bonded in a 3-coordinate geometry to one C(2), one C(3), and one N(3) atom. The N(2)-N(3) bond length is 1.35 Å. In the third N site, N(3) is bonded in a distorted water-like geometry to one C(4) and one N(2) atom. There are three inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(4) atom. Linkers: 1 [CH]1N=C[N]N1Cc1c(CN2[CH]N=C[N]2)c(CN2[CH]N=C[N]2)c(CN2[CH]N=C[N]2)c(CN2[CH]N=C[N]2)c1CN1[CH]N=C[N]1 ,3 [CH]1N=C[N]N1Cc1c(CN2[CH]N=C[N]2)c(CN2[CH]N=C[N]2)c(Cn2cncn2)c(Cn2cncn2)c1CN1[CH]N=C[N]1 ,4 [CH]1N=C[N]N1Cc1c(CN2[CH]N=C[N]2)c(Cn2cncn2)c(CN2[CH]N=C[N]2)c(Cn2cncn2)c1CN1[CH]N=C[N]1 ,2 [CH]1N=C[N]N1Cc1c(CN2[CH]N=C[N]2)c(CN2[CH]N=C[N]2)c(Cn2cncn2)c(CN2[CH]N=C[N]2)c1CN1[CH]N=C[N]1. Metal clusters: 12 [N][Cu]([N])([N])([N])[Cu]. The MOF has largest included sphere 9.22 A, density 1.32 g/cm3, surface area 3730.01 m2/g, accessible volume 0.39 cm3/g