CuH6(C3O)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a bent 150 degrees geometry to two equivalent O(1) atoms. Both Cu(1)-O(1) bond lengths are 1.86 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent O(2) atoms. Both Cu(2)-O(2) bond lengths are 1.85 Å. There are six inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(2) bond length is 1.40 Å. The C(3)-C(4) bond length is 1.50 Å. The C(3)-C(5) bond length is 1.41 Å. In the second C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(3), one H(1), one H(2), and one H(3) atom. The C(4)-H(1) bond length is 1.10 Å. The C(4)-H(2) bond length is 1.10 Å. The C(4)-H(3) bond length is 1.10 Å. In the third C site, C(5) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(6) atom. The C(5)-C(2) bond length is 1.40 Å. The C(5)-C(6) bond length is 1.50 Å. In the fourth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one C(5), one H(4), one H(5), and one H(6) atom. The C(6)-H(4) bond length is 1.10 Å. The C(6)-H(5) bond length is 1.10 Å. The C(6)-H(6) bond length is 1.10 Å. In the fifth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(1) bond length is 1.50 Å. In the sixth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.28 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) 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 C(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(6) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(1) atom. Linkers: 2 [CH2]c1c(C)c(C([O])=O)c(C)c(C)c1C([O])=O ,2 Cc1c(C)c(C([O])=O)c(C)c(C)c1C([O])=O. Metal clusters: 4 [Cu]. The MOF has largest included sphere 2.52 A, density 1.92 g/cm3, surface area 3799.81 m2/g, accessible volume 0.13 cm3/g