Cr3Cu3C36N6H24O13 crystallizes in the hexagonal P6_3/m space group. Cr(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing CrO5 square pyramids. The Cr(1)-O(3) bond length is 1.90 Å. Both Cr(1)-O(1) bond lengths are 1.97 Å. Both Cr(1)-O(2) bond lengths are 1.94 Å. Cu(1) is bonded in a linear geometry to two equivalent N(1) atoms. Both Cu(1)-N(1) bond lengths are 1.99 Å. There are six inequivalent C sites. In the first C site, C(5) is bonded in a distorted single-bond geometry to one C(4) and one H(3) atom. The C(5)-C(4) bond length is 1.39 Å. The C(5)-H(3) bond length is 0.95 Å. In the second C site, C(6) is bonded in a distorted single-bond geometry to one C(2) and one H(4) atom. The C(6)-C(2) bond length is 1.41 Å. The C(6)-H(4) bond length is 0.95 Å. In the third 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)-C(2) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.23 Å. In the fourth 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 1.41 Å. In the fifth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(1) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-H(1) bond length is 0.95 Å. In the sixth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one H(2) atom. The C(4)-N(1) bond length is 1.36 Å. The C(4)-H(2) bond length is 0.95 Å. N(1) is bonded in a trigonal planar geometry to one Cu(1), one C(3), and one C(4) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) 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(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. There are three inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to three equivalent Cr(1) atoms. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one C(1) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one C(1) atom. Linkers: 12 [O]C(=O)c1cccnc1. Metal clusters: 2 [C]1O[Cr]23O[C]O[Cr]45(O1)O[C]O[Cr](O[C]O2)(O[C]O3)(O[C]O4)O5 ,6 [Cu]. The MOF has largest included sphere 14.33 A, density 0.46 g/cm3, surface area 4048.02 m2/g, accessible volume 1.69 cm3/g