Cu2C9H5O7 crystallizes in the tetragonal P4/nmm 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 1.85 Å. In the second Cu site, Cu(2) is bonded in a square pyramidal geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Cu(2)-O(4) bond length is 2.22 Å. Both Cu(2)-O(2) bond lengths are 1.98 Å. Both Cu(2)-O(3) bond lengths are 1.99 Å. There are six inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. The C(2)-C(1) bond length is 1.49 Å. Both C(2)-C(3) bond lengths are 1.40 Å. In the second C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(1) bond length is 1.09 Å. In the third C site, C(5) is bonded in a distorted trigonal planar geometry to two equivalent C(4) and one H(2) atom. Both C(5)-C(4) bond lengths are 1.40 Å. The C(5)-H(2) bond length is 1.09 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(3) atom. The C(6)-C(4) bond length is 1.50 Å. The C(6)-O(2) bond length is 1.28 Å. The C(6)-O(3) bond length is 1.27 Å. In the fifth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2) and two equivalent O(1) atoms. Both C(1)-O(1) bond lengths are 1.28 Å. In the sixth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(6) atom. There are four inequivalent H sites. In the first H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(3) is bonded in a single-bond geometry to one O(4) atom. The H(3)-O(4) bond length is 0.97 Å. In the third H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. The H(4)-O(4) bond length is 0.98 Å. There are four 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(3) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(6) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(6) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Cu(2), one H(3), and one H(4) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 2 [C]1O[Cu]23O[C]O[Cu]24O[C]O[Cu]42O[C]O[Cu]32O1 ,4 O.O.[C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. RCSR code: mmm. The MOF has largest included sphere 7.07 A, density 1.79 g/cm3, surface area 3150.62 m2/g, accessible volume 0.25 cm3/g