UH6(C2O)6(UC25H14O6)3U4H48(C29O8)3 crystallizes in the trigonal R3m space group. The structure consists of three UH6(C2O)6 clusters, one U4H48(C29O8)3 framework, and one UC25H14O6 framework. In each UH6(C2O)6 cluster, U(1) is bonded in a hexagonal planar geometry to six equivalent O(2) atoms. All U(1)-O(2) bond lengths are 2.45 Å. There are three inequivalent C sites. In the first C site, C(10) is bonded in a distorted single-bond geometry to one C(14) and one H(7) atom. The C(10)-C(14) bond length is 1.39 Å. The C(10)-H(7) bond length is 0.95 Å. In the second C site, C(14) is bonded in a trigonal planar geometry to one C(15) and two equivalent C(10) atoms. The C(14)-C(15) bond length is 1.50 Å. In the third C site, C(15) is bonded in a distorted trigonal planar geometry to one C(14) and two equivalent O(2) atoms. Both C(15)-O(2) bond lengths are 1.27 Å. H(7) is bonded in a single-bond geometry to one C(10) atom. O(2) is bonded in a distorted single-bond geometry to one U(1) and one C(15) atom. In the U4H48(C29O8)3 framework, there are two inequivalent U sites. In the first U site, U(3) is bonded in a hexagonal planar geometry to two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. Both U(3)-O(6) bond lengths are 2.48 Å. Both U(3)-O(7) bond lengths are 2.42 Å. Both U(3)-O(8) bond lengths are 2.46 Å. In the second U site, U(4) is bonded in a hexagonal planar geometry to six equivalent O(5) atoms. All U(4)-O(5) bond lengths are 2.46 Å. There are eighteen inequivalent C sites. In the first C site, C(19) is bonded in a bent 120 degrees geometry to one C(20), one O(6), and one O(7) atom. The C(19)-C(20) bond length is 1.45 Å. The C(19)-O(6) bond length is 1.24 Å. The C(19)-O(7) bond length is 1.29 Å. In the second C site, C(20) is bonded in a trigonal planar geometry to one C(19), one C(21), and one C(27) atom. The C(20)-C(21) bond length is 1.38 Å. The C(20)-C(27) bond length is 1.36 Å. In the third C site, C(21) is bonded in a distorted single-bond geometry to one C(20) and one H(9) atom. The C(21)-H(9) bond length is 0.95 Å. In the fourth C site, C(22) is bonded in a trigonal planar geometry to one C(23), one C(24), and one C(31) atom. The C(22)-C(23) bond length is 1.36 Å. The C(22)-C(24) bond length is 1.39 Å. The C(22)-C(31) bond length is 1.52 Å. In the fifth C site, C(23) is bonded in a distorted single-bond geometry to one C(22) and one H(10) atom. The C(23)-H(10) bond length is 0.95 Å. In the sixth C site, C(24) is bonded in a distorted single-bond geometry to one C(22), one C(27), and one H(11) atom. The C(24)-C(27) bond length is 1.37 Å. The C(24)-H(11) bond length is 0.95 Å. In the seventh C site, C(25) is bonded in a distorted trigonal planar geometry to one C(26), one C(32), and one H(12) atom. The C(25)-C(26) bond length is 1.34 Å. The C(25)-C(32) bond length is 1.33 Å. The C(25)-H(12) bond length is 0.95 Å. In the eighth C site, C(26) is bonded in a distorted single-bond geometry to one C(25), one C(30), and one H(13) atom. The C(26)-C(30) bond length is 1.38 Å. The C(26)-H(13) bond length is 0.95 Å. In the ninth C site, C(27) is bonded in a distorted trigonal planar geometry to one C(20), one C(24), and one H(14) atom. The C(27)-H(14) bond length is 0.95 Å. In the tenth C site, C(28) is bonded in a distorted single-bond geometry to one C(29), one C(34), and one H(15) atom. The C(28)-C(29) bond length is 1.37 Å. The C(28)-C(34) bond length is 1.38 Å. The C(28)-H(15) bond length is 0.95 Å. In the eleventh C site, C(29) is bonded in a distorted trigonal planar geometry to one C(28), one C(35), and one H(16) atom. The C(29)-C(35) bond length is 1.38 Å. The C(29)-H(16) bond length is 0.95 Å. In the twelfth C site, C(30) is bonded in a trigonal planar geometry to one C(31) and two equivalent C(26) atoms. The C(30)-C(31) bond length is 1.60 Å. In the thirteenth C site, C(31) is bonded in a tetrahedral geometry to one C(30), one C(34), and two equivalent C(22) atoms. The C(31)-C(34) bond length is 1.56 Å. In the fourteenth C site, C(32) is bonded in a trigonal planar geometry to one C(33) and two equivalent C(25) atoms. The C(32)-C(33) bond length is 1.56 Å. In the fifteenth C site, C(33) is bonded in a trigonal planar geometry to one C(32) and two equivalent O(5) atoms. Both C(33)-O(5) bond lengths are 1.26 Å. In the sixteenth C site, C(34) is bonded in a trigonal planar geometry to one C(31) and two equivalent C(28) atoms. In the seventeenth C site, C(35) is bonded in a trigonal planar geometry to one C(36) and two equivalent C(29) atoms. The C(35)-C(36) bond length is 1.54 Å. In the eighteenth C site, C(36) is bonded in a distorted bent 120 degrees geometry to one C(35) and two equivalent O(8) atoms. Both C(36)-O(8) bond lengths are 1.23 Å. There are eight inequivalent H sites. In the first H site, H(9) is bonded in a single-bond geometry to one C(21) atom. In the second H site, H(10) is bonded in a single-bond geometry to one C(23) atom. In the third H site, H(11) is bonded in a single-bond geometry to one C(24) atom. In the fourth H site, H(12) is bonded in a single-bond geometry to one C(25) atom. In the fifth H site, H(13) is bonded in a single-bond geometry to one C(26) atom. In the sixth H site, H(14) is bonded in a single-bond geometry to one C(27) atom. In the seventh H site, H(15) is bonded in a single-bond geometry to one C(28) atom. In the eighth H site, H(16) is bonded in a single-bond geometry to one C(29) atom. There are four inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one U(4) and one C(33) atom. In the second O site, O(6) is bonded in a distorted L-shaped geometry to one U(3) and one C(19) atom. In the third O site, O(7) is bonded in a distorted L-shaped geometry to one U(3) and one C(19) atom. In the fourth O site, O(8) is bonded in a distorted L-shaped geometry to one U(3) and one C(36) atom. In the UC25H14O6 framework, U(2) is bonded in a hexagonal planar geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both U(2)-O(1) bond lengths are 2.45 Å. Both U(2)-O(3) bond lengths are 2.43 Å. Both U(2)-O(4) bond lengths are 2.47 Å. There are fifteen inequivalent C sites. In the first C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(17) and two equivalent O(1) atoms. The C(18)-C(17) bond length is 1.42 Å. Both C(18)-O(1) bond lengths are 1.30 Å. In the second C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.33 Å. The C(1)-H(1) bond length is 0.95 Å. In the third C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(3) atom. The C(2)-C(12) bond length is 1.51 Å. The C(2)-C(3) bond length is 1.34 Å. In the fourth C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(2) atom. The C(3)-C(5) bond length is 1.40 Å. The C(3)-H(2) bond length is 0.95 Å. In the fifth C site, C(4) is bonded in a trigonal planar geometry to one C(5), one C(6), and one C(7) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-C(6) bond length is 1.38 Å. The C(4)-C(7) bond length is 1.46 Å. In the sixth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one H(3) atom. The C(5)-H(3) bond length is 0.95 Å. In the seventh C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(4), and one H(4) atom. The C(6)-H(4) bond length is 0.95 Å. In the eighth C site, C(7) is bonded in a distorted trigonal planar geometry to one C(4), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.29 Å. The C(7)-O(4) bond length is 1.26 Å. In the ninth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(17), one C(9), and one H(5) atom. The C(8)-C(17) bond length is 1.44 Å. The C(8)-C(9) bond length is 1.34 Å. The C(8)-H(5) bond length is 0.95 Å. In the tenth C site, C(9) is bonded in a single-bond geometry to one C(13), one C(8), and one H(6) atom. The C(9)-C(13) bond length is 1.39 Å. The C(9)-H(6) bond length is 0.95 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(16) and one H(8) atom. The C(11)-C(16) bond length is 1.42 Å. The C(11)-H(8) bond length is 0.95 Å. In the twelfth C site, C(12) is bonded in a tetrahedral geometry to one C(13), one C(16), and two equivalent C(2) atoms. The C(12)-C(13) bond length is 1.61 Å. The C(12)-C(16) bond length is 1.58 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(12) and two equivalent C(9) atoms. In the fourteenth C site, C(16) is bonded in a trigonal planar geometry to one C(12) and two equivalent C(11) atoms. In the fifteenth C site, C(17) is bonded in a trigonal planar geometry to one C(18) and two equivalent C(8) atoms. There are seven 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(3) 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. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(8) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one C(11) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to one U(2) and one C(18) atom. In the second O site, O(3) is bonded in a distorted L-shaped geometry to one U(2) and one C(7) atom. In the third O site, O(4) is bonded in a distorted L-shaped geometry to one U(2) and one C(7) atom. Linkers: 18 [O]C(=O)c1ccc(C(c2ccc(C([O])=O)cc2)(c2ccc(C([O])=O)cc2)c2ccc(C([O])=O)cc2)cc1. Metal clusters: 24 [C]1O[U]23(O1)(O[C]O2)O[C]O3. RCSR code: bor. The MOF has largest included sphere 11.28 A, density 0.91 g/cm3, surface area 3237.19 m2/g, accessible volume 0.78 cm3/g