CuC5H7O7 crystallizes in the monoclinic C2/c space group. Cu(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), one O(6), and one O(7) atom. The Cu(1)-O(2) bond length is 1.95 Å. The Cu(1)-O(4) bond length is 2.03 Å. The Cu(1)-O(5) bond length is 2.00 Å. The Cu(1)-O(6) bond length is 1.98 Å. The Cu(1)-O(7) bond length is 2.36 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(4) atom. The C(1)-C(1) bond length is 1.40 Å. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(4) bond length is 1.50 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(5) atom. The C(3)-C(3) bond length is 1.41 Å. The C(3)-C(5) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(4)-O(1) bond length is 1.25 Å. The C(4)-O(2) bond length is 1.29 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.26 Å. The C(5)-O(4) bond length is 1.29 Å. There are seven 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 linear geometry to one O(1) and one O(5) atom. The H(2)-O(1) bond length is 1.57 Å. The H(2)-O(5) bond length is 1.02 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 0.97 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 0.99 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(6) atom. The H(5)-O(6) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a distorted linear geometry to one O(3) and one O(7) atom. The H(6)-O(3) bond length is 1.55 Å. The H(6)-O(7) bond length is 1.02 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(7) atom. The H(7)-O(7) bond length is 0.97 Å. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a water-like geometry to one Cu(1), one H(6), and one H(7) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one C(4) and one H(2) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(4) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one C(5) and one H(6) atom. In the fifth O site, O(4) is bonded in a distorted water-like geometry to one Cu(1) and one C(5) atom. In the sixth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one H(2), and one H(3) atom. In the seventh O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one H(4), and one H(5) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 O.O.O.O=[C]O[Cu]O[C]=O. The MOF has largest included sphere 3.53 A, density 1.81 g/cm3, surface area 3568.80 m2/g, accessible volume 0.17 cm3/g