CuH2(C3O2)2 crystallizes in the tetragonal I422 space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1,6) and two equivalent O(3,4) atoms. Both Cu(1)-O(1,6) bond lengths are 1.95 Å. Both Cu(1)-O(3,4) bond lengths are 1.95 Å. In the second Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1,6) and two equivalent O(3,4) atoms. Both Cu(1)-O(1,6) bond lengths are 1.95 Å. Both Cu(1)-O(3,4) bond lengths are 1.95 Å. In the third Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(5) atoms. Both Cu(2)-O(2) bond lengths are 1.95 Å. Both Cu(2)-O(5) bond lengths are 1.95 Å. There are eleven inequivalent C sites. In the first C site, C(1,3) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(1) atom. The C(1,3)-C(5) bond length is 1.41 Å. The C(1,3)-C(7) bond length is 1.41 Å. The C(1,3)-H(1) bond length is 1.14 Å. In the second C site, C(1,3) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(1) atom. The C(1,3)-C(5) bond length is 1.41 Å. The C(1,3)-C(7) bond length is 1.41 Å. The C(1,3)-H(1) bond length is 1.14 Å. In the third C site, C(2) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(2) atom. The C(2)-C(7) bond length is 1.41 Å. The C(2)-C(9) bond length is 1.41 Å. The C(2)-H(2) bond length is 1.14 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(5) and two equivalent O(1,6) atoms. The C(4)-C(5) bond length is 1.50 Å. Both C(4)-O(1,6) bond lengths are 1.26 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two C(1,1,3,3) atoms. In the sixth C site, C(6,8) is bonded in a bent 120 degrees geometry to one C(7), one O(2), and one O(5) atom. The C(6,8)-C(7) bond length is 1.50 Å. The C(6,8)-O(2) bond length is 1.26 Å. The C(6,8)-O(5) bond length is 1.26 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(1,3); one C(2); and one C(6,8) atom. In the eighth C site, C(7) is bonded in a trigonal planar geometry to one C(1,3); one C(2); and one C(6,8) atom. The C(7)-C(2) bond length is 1.41 Å. The C(7)-C(6,8) bond length is 1.50 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(1,3); one C(2); and one C(6,8) atom. The C(9)-C(1,3) bond length is 1.41 Å. The C(9)-C(6,8) bond length is 1.50 Å. In the tenth C site, C(9) is bonded in a trigonal planar geometry to one C(1,3); one C(2); and one C(6,8) atom. The C(9)-C(1,3) bond length is 1.41 Å. The C(9)-C(2) bond length is 1.41 Å. The C(9)-C(6,8) bond length is 1.50 Å. In the eleventh C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two C(1,1,3,3) atoms. The C(5)-C(4) bond length is 1.50 Å. Both C(5)-C(1,1,3,3) bond lengths are 1.41 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1,3) atom. 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 C(1,3) atom. The H(3)-C(1,3) bond length is 1.14 Å. There are four inequivalent O sites. In the first O site, O(1,6) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(6,8) atom. In the third O site, O(3,4) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(6,8) atom. The O(3,4)-C(6,8) bond length is 1.26 Å. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(6,8) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 6 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. RCSR code: tbo. The MOF has largest included sphere 13.20 A, density 0.88 g/cm3, surface area 3229.13 m2/g, accessible volume 0.85 cm3/g