CuC5N4H5 crystallizes in the orthorhombic Pca2_1 space group. Cu(1) is bonded in a tetrahedral geometry to one C(5), one N(1), one N(2), and one N(4) atom. The Cu(1)-C(5) bond length is 1.87 Å. The Cu(1)-N(1) bond length is 2.05 Å. The Cu(1)-N(2) bond length is 2.06 Å. The Cu(1)-N(4) bond length is 1.98 Å. There are five inequivalent C sites. In the first C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one N(2), and one H(2) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-N(2) bond length is 1.36 Å. The C(3)-H(2) bond length is 1.09 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one N(1), and one H(3) atom. The C(4)-N(1) bond length is 1.35 Å. The C(4)-H(3) bond length is 1.09 Å. In the third C site, C(5) is bonded in a linear geometry to one Cu(1) and one N(4) atom. The C(5)-N(4) bond length is 1.18 Å. In the fourth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one N(3) atom. The C(1)-C(2) bond length is 1.42 Å. The C(1)-N(1) bond length is 1.36 Å. The C(1)-N(3) bond length is 1.34 Å. In the fifth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(2), and one H(1) atom. The C(2)-N(2) bond length is 1.33 Å. The C(2)-H(1) bond length is 1.09 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cu(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(2), and one C(3) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(1), one H(4), and one H(5) atom. The N(3)-H(4) bond length is 1.02 Å. The N(3)-H(5) bond length is 1.02 Å. In the fourth N site, N(4) is bonded in a distorted linear geometry to one Cu(1) and one C(5) atom. There are five 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(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one N(3) atom. Linkers: 4 Nc1cnccn1. Metal clusters: 4 [Cu]. The MOF has largest included sphere 1.72 A, density 1.96 g/cm3, surface area 3926.28 m2/g, accessible volume 0.12 cm3/g