U3P4H4(C2O3)4(CH2)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a U3P4H4(C2O3)4 framework. In the U3P4H4(C2O3)4 framework, there are three inequivalent U sites. In the first U site, U(1) is bonded in a distorted pentagonal planar geometry to one O(1), one O(10), one O(11), one O(5), and one O(8) atom. The U(1)-O(1) bond length is 2.29 Å. The U(1)-O(10) bond length is 2.59 Å. The U(1)-O(11) bond length is 2.42 Å. The U(1)-O(5) bond length is 2.32 Å. The U(1)-O(8) bond length is 2.36 Å. In the second U site, U(2) is bonded in a distorted pentagonal planar geometry to one O(10), one O(2), one O(4), one O(7), and one O(8) atom. The U(2)-O(10) bond length is 2.36 Å. The U(2)-O(2) bond length is 2.27 Å. The U(2)-O(4) bond length is 2.29 Å. The U(2)-O(7) bond length is 2.41 Å. The U(2)-O(8) bond length is 2.60 Å. In the third U site, U(3) is bonded in a rectangular see-saw-like geometry to one O(12), one O(3), one O(6), and one O(9) atom. The U(3)-O(12) bond length is 2.27 Å. The U(3)-O(3) bond length is 2.26 Å. The U(3)-O(6) bond length is 2.28 Å. The U(3)-O(9) bond length is 2.31 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted water-like geometry to one P(1), one H(1), and one H(2) atom. The C(1)-P(1) bond length is 1.80 Å. The C(1)-H(1) bond length is 0.97 Å. The C(1)-H(2) bond length is 0.97 Å. In the second C site, C(3) is bonded in a distorted water-like geometry to one P(2) and two equivalent H(5,6) atoms. The C(3)-P(2) bond length is 1.79 Å. Both C(3)-H(5,6) bond lengths are 0.97 Å. In the third C site, C(5) is bonded in a 3-coordinate geometry to one C(10), one C(6), and one P(4) atom. The C(5)-C(10) bond length is 1.34 Å. The C(5)-C(6) bond length is 1.43 Å. The C(5)-P(4) bond length is 1.78 Å. In the fourth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) atom. In the fifth C site, C(7) is bonded in a distorted trigonal non-coplanar geometry to one C(8), one C(9), and one P(3) atom. The C(7)-C(8) bond length is 1.47 Å. The C(7)-C(9) bond length is 1.41 Å. The C(7)-P(3) bond length is 1.78 Å. In the sixth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(7) and one C(9) atom. The C(8)-C(9) bond length is 1.61 Å. In the seventh C site, C(9) is bonded in a distorted single-bond geometry to one C(7) and one C(8) atom. In the eighth C site, C(10) is bonded in a distorted single-bond geometry to one C(5) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one C(1), one O(1), one O(2), and one O(3) atom. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.52 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one C(3), one O(4), one O(5), and one O(6) atom. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.52 Å. In the third P site, P(3) is bonded in a tetrahedral geometry to one C(7), one O(7), one O(8), and one O(9) atom. The P(3)-O(7) bond length is 1.51 Å. The P(3)-O(8) bond length is 1.54 Å. The P(3)-O(9) bond length is 1.52 Å. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one C(5), one O(10), one O(11), and one O(12) atom. The P(4)-O(10) bond length is 1.53 Å. The P(4)-O(11) bond length is 1.52 Å. The P(4)-O(12) bond length is 1.51 Å. There are three 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(1) atom. In the third H site, H(5,6) is bonded in a single-bond geometry to one C(3) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one U(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one U(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one U(3) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one U(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one U(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one U(3) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one U(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one U(3) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one U(1) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one U(3) and one P(4) atom. Linkers: 5 [O]P([O])(=O)CCCCP([O])([O])=O ,4 [O]P([O])(=O)[C]1[C][C][C](P([O])([O])=O)[C][C]1. Metal clusters: 12 [U]. The MOF has largest included sphere 5.90 A, density 2.25 g/cm3, surface area 1974.32 m2/g, accessible volume 0.23 cm3/g