Cu6C51H18O28 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(1) atoms. All Cu(1)-O(1) bond lengths are 1.95 Å. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(2) atoms. All Cu(2)-O(2) bond lengths are 1.95 Å. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(5) atoms. Both Cu(3)-O(3) bond lengths are 1.96 Å. Both Cu(3)-O(5) bond lengths are 1.96 Å. In the fourth Cu site, Cu(4) is bonded in a distorted square co-planar geometry to two equivalent O(4) and two equivalent O(6) atoms. Both Cu(4)-O(4) bond lengths are 1.97 Å. Both Cu(4)-O(6) bond lengths are 1.96 Å. There are fifteen inequivalent C sites. In the first C site, C(15) is bonded in a distorted bent 120 degrees geometry to two equivalent C(13) and two equivalent O(8) atoms. Both C(15)-C(13) bond lengths are 1.54 Å. Both C(15)-O(8) bond lengths are 1.38 Å. In the second C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(6) bond length is 1.38 Å. The C(1)-C(7) bond length is 1.53 Å. In the third 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 0.95 Å. In the fourth C site, C(3) is bonded in a trigonal planar geometry to one C(12), one C(2), and one C(4) atom. The C(3)-C(12) bond length is 1.50 Å. The C(3)-C(4) bond length is 1.38 Å. In the fifth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-H(2) bond length is 0.95 Å. In the sixth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-C(8) bond length is 1.49 Å. In the seventh C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one H(3) atom. The C(6)-H(3) bond length is 0.95 Å. In the eighth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.25 Å. The C(7)-O(2) bond length is 1.24 Å. In the ninth C site, C(8) is bonded in a bent 120 degrees geometry to one C(5), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.25 Å. The C(8)-O(4) bond length is 1.27 Å. In the tenth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(14) atom. The C(9)-C(10) bond length is 1.41 Å. The C(9)-C(11) bond length is 1.50 Å. The C(9)-C(14) bond length is 1.39 Å. In the eleventh C site, C(10) is bonded in a distorted single-bond geometry to one C(13), one C(9), and one H(4) atom. The C(10)-C(13) bond length is 1.39 Å. The C(10)-H(4) bond length is 0.95 Å. In the twelfth C site, C(11) is bonded in a bent 120 degrees geometry to one C(9), one O(5), and one O(6) atom. The C(11)-O(5) bond length is 1.25 Å. The C(11)-O(6) bond length is 1.25 Å. In the thirteenth C site, C(12) is bonded in a distorted trigonal planar geometry to two equivalent C(3) and one O(7) atom. The C(12)-O(7) bond length is 1.21 Å. In the fourteenth C site, C(13) is bonded in a trigonal planar geometry to one C(15) and two equivalent C(10) atoms. In the fifteenth C site, C(14) is bonded in a distorted single-bond geometry to two equivalent C(9) and one H(5) atom. The C(14)-H(5) bond length is 0.95 Å. There are five 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 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(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(14) atom. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a single-bond geometry to one C(12) atom. In the second O site, O(8) is bonded in a single-bond geometry to one C(15) atom. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(7) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(7) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(3) and one C(8) atom. In the sixth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cu(4) and one C(8) atom. In the seventh O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Cu(3) and one C(11) atom. In the eighth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cu(4) and one C(11) atom. Linkers: 8 [O]C(=O)c1cc(C([O])=O)cc(C([O])([O])c2cc(C([O])=O)cc(C([O])=O)c2)c1 ,16 [O]C(=O)c1cc(C([O])=O)cc(C(=O)c2cc(C([O])=O)cc(C([O])=O)c2)c1. Metal clusters: 24 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4. The MOF has largest included sphere 13.04 A, density 0.90 g/cm3, surface area 3483.61 m2/g, accessible volume 0.74 cm3/g