U3Zn(PO4)4 crystallizes in the triclinic P-1 space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a distorted pentagonal planar geometry to one O(12), one O(4), one O(7), and two equivalent O(3) atoms. The U(1)-O(12) bond length is 2.30 Å. The U(1)-O(4) bond length is 2.45 Å. The U(1)-O(7) bond length is 2.30 Å. There is one shorter (2.40 Å) and one longer (2.54 Å) U(1)-O(3) bond length. In the second U site, U(2) is bonded in a distorted pentagonal planar geometry to one O(11), one O(16), one O(6), and two equivalent O(5) atoms. The U(2)-O(11) bond length is 2.32 Å. The U(2)-O(16) bond length is 2.29 Å. The U(2)-O(6) bond length is 2.41 Å. There is one shorter (2.38 Å) and one longer (2.51 Å) U(2)-O(5) bond length. In the third U site, U(3) is bonded in a 5-coordinate geometry to one O(14), one O(8), one O(9), and two equivalent O(10) atoms. The U(3)-O(14) bond length is 2.28 Å. The U(3)-O(8) bond length is 2.29 Å. The U(3)-O(9) bond length is 2.47 Å. There is one shorter (2.40 Å) and one longer (2.56 Å) U(3)-O(10) bond length. Zn(1) is bonded to one O(13), one O(15), one O(2), and one O(9) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Zn(1)-O(13) bond length is 1.94 Å. The Zn(1)-O(15) bond length is 1.91 Å. The Zn(1)-O(2) bond length is 1.95 Å. The Zn(1)-O(9) bond length is 1.97 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.54 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.51 Å. The P(2)-O(8) bond length is 1.50 Å. In the third P site, P(3) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra. The P(3)-O(10) bond length is 1.53 Å. The P(3)-O(11) bond length is 1.53 Å. The P(3)-O(12) bond length is 1.50 Å. The P(3)-O(9) bond length is 1.57 Å. In the fourth P site, P(4) is bonded to one O(13), one O(14), one O(15), and one O(16) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra. The P(4)-O(13) bond length is 1.55 Å. The P(4)-O(14) bond length is 1.54 Å. The P(4)-O(15) bond length is 1.52 Å. The P(4)-O(16) bond length is 1.53 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one U(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent U(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one U(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one U(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one U(3) and one P(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one U(3), one Zn(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to two equivalent U(3) and one P(3) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one U(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one U(1) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one U(3) and one P(4) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(4) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one U(2) and one P(4) atom. Linkers: 8 [O]P([O])([O])=O. Metal clusters: 6 [U] ,2 [Zn]. The MOF has largest included sphere 7.47 A, density 2.40 g/cm3, surface area 1494.16 m2/g, accessible volume 0.23 cm3/g