Cu6C27N12H9O13 crystallizes in the cubic Fm-3m space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. All Cu(1)-O(2) bond lengths are 1.94 Å. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(1) atoms. All Cu(2)-O(1) bond lengths are 1.96 Å. In the third Cu site, Cu(3) is bonded in a distorted T-shaped geometry to two equivalent N(2) and one O(3) atom. Both Cu(3)-N(2) bond lengths are 1.95 Å. The Cu(3)-O(3) bond length is 1.94 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(1) atom. The C(1)-C(2) bond length is 1.35 Å. The C(1)-C(5) bond length is 1.40 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.53 Å. The C(2)-C(6) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.25 Å. The C(3)-O(2) bond length is 1.22 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(5) and two equivalent N(1) atoms. The C(4)-C(5) bond length is 1.55 Å. Both C(4)-N(1) bond lengths are 1.31 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(2) atom. The C(6)-H(2) bond length is 0.93 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a single-bond geometry to one C(4) and one N(2) atom. The N(1)-N(2) bond length is 1.41 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cu(3), one N(1), and one N(2) atom. The N(2)-N(2) bond length is 1.25 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(3) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to three equivalent Cu(3) atoms. Linkers: 96 [O]C(=O)c1cc(C([O])=O)cc(C2=N[N][N][N]2)c1. Metal clusters: 48 [C]1O[Cu]234O[C]O[Cu]2(O1)(O[C]O3)O[C]O4 ,32 N1=N[Cu]2N=N[Cu](N=N[Cu]1)O2. The MOF has largest included sphere 21.70 A, density 0.66 g/cm3, surface area 3202.42 m2/g, accessible volume 1.29 cm3/g