CuC3H4(N2O)4 crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded in a distorted trigonal bipyramidal geometry to one N(1), one N(3), one N(4), one N(7), and one O(1) atom. The Cu(1)-N(1) bond length is 1.96 Å. The Cu(1)-N(3) bond length is 2.39 Å. The Cu(1)-N(4) bond length is 2.01 Å. The Cu(1)-N(7) bond length is 2.03 Å. The Cu(1)-O(1) bond length is 2.00 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one N(4) and one N(5) atom. The C(1)-N(4) bond length is 1.37 Å. The C(1)-N(5) bond length is 1.33 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(4), one N(6), and one H(2) atom. The C(2)-N(4) bond length is 1.34 Å. The C(2)-N(6) bond length is 1.34 Å. The C(2)-H(2) bond length is 1.08 Å. In the third C site, C(3) is bonded in a distorted water-like geometry to one N(3) and one N(7) atom. The C(3)-N(3) bond length is 1.34 Å. The C(3)-N(7) bond length is 1.35 Å. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cu(1), one N(2), and one N(7) atom. The N(1)-N(2) bond length is 1.32 Å. The N(1)-N(7) bond length is 1.33 Å. In the second N site, N(2) is bonded in a water-like geometry to one N(1) and one N(3) atom. The N(2)-N(3) bond length is 1.34 Å. In the third N site, N(3) is bonded in a 3-coordinate geometry to one Cu(1), one C(3), and one N(2) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Cu(1), one C(1), and one C(2) atom. In the fifth N site, N(5) is bonded in a distorted water-like geometry to one C(1) and one N(6) atom. The N(5)-N(6) bond length is 1.36 Å. In the sixth N site, N(6) is bonded in a 2-coordinate geometry to one C(2), one N(5), and one H(1) atom. The N(6)-H(1) bond length is 1.05 Å. In the seventh N site, N(7) is bonded in a 3-coordinate geometry to one Cu(1), one C(3), and one N(1) atom. In the eighth N site, N(8) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. The N(8)-O(2) bond length is 1.29 Å. The N(8)-O(3) bond length is 1.26 Å. The N(8)-O(4) bond length is 1.25 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one N(6) and one O(3) atom. The H(1)-O(3) bond length is 1.70 Å. 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 O(1) and one O(2) atom. The H(3)-O(1) bond length is 1.00 Å. The H(3)-O(2) bond length is 1.71 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(1) and one O(2) atom. The H(4)-O(1) bond length is 0.99 Å. The H(4)-O(2) bond length is 1.77 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cu(1), one H(3), and one H(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one N(8), one H(3), and one H(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one N(8) and one H(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one N(8) atom. Linkers: 1 c1nc(C2=NN=N[N]2)n[nH]1 ,3 [CH]1N=C(C2=NN=N[N]2)[N]N1. Metal clusters: 2 N1=N[Cu]=NN=[Cu]1.O.O. The MOF has largest included sphere 1.77 A, density 2.25 g/cm3, surface area 3436.66 m2/g, accessible volume 0.11 cm3/g