Rb2U5(PO7)4 crystallizes in the monoclinic Cm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one O(15), one O(16), two equivalent O(14), two equivalent O(2), two equivalent O(5), and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded to one O(11), one O(12), one O(16), two equivalent O(1), and two equivalent O(9) atoms to form RbO7 hexagonal pyramids that share corners with two equivalent U(3)O7 pentagonal bipyramids. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. In the second U site, U(2) is bonded in a 7-coordinate geometry to one O(10), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the third U site, U(3) is bonded to one O(11), one O(12), one O(15), two equivalent O(13), and two equivalent O(14) atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent Rb(2)O7 hexagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(13), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one U(3)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one O(10), one O(14), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one U(3)O7 pentagonal bipyramid. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Rb(2) and one U(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1) and one U(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one U(1), 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 Rb(1), one U(1), one U(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Rb(1) and one U(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(2) and one U(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one U(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Rb(2) and one U(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Rb(2) and one U(3) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one U(3) and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Rb(1), one U(3), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one U(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Rb(1) and one Rb(2) atom.
Rb2U5(PO7)4 crystallizes in the monoclinic Cm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one O(15), one O(16), two equivalent O(14), two equivalent O(2), two equivalent O(5), and two equivalent O(8) atoms. The Rb(1)-O(15) bond length is 3.30 Å. The Rb(1)-O(16) bond length is 3.15 Å. Both Rb(1)-O(14) bond lengths are 3.09 Å. Both Rb(1)-O(2) bond lengths are 3.06 Å. Both Rb(1)-O(5) bond lengths are 3.13 Å. Both Rb(1)-O(8) bond lengths are 3.22 Å. In the second Rb site, Rb(2) is bonded to one O(11), one O(12), one O(16), two equivalent O(1), and two equivalent O(9) atoms to form RbO7 hexagonal pyramids that share corners with two equivalent U(3)O7 pentagonal bipyramids. The Rb(2)-O(11) bond length is 3.30 Å. The Rb(2)-O(12) bond length is 3.24 Å. The Rb(2)-O(16) bond length is 3.07 Å. Both Rb(2)-O(1) bond lengths are 3.04 Å. Both Rb(2)-O(9) bond lengths are 2.98 Å. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The U(1)-O(1) bond length is 1.80 Å. The U(1)-O(2) bond length is 1.80 Å. The U(1)-O(3) bond length is 2.28 Å. The U(1)-O(4) bond length is 2.40 Å. The U(1)-O(5) bond length is 2.42 Å. The U(1)-O(6) bond length is 2.54 Å. The U(1)-O(7) bond length is 2.51 Å. In the second U site, U(2) is bonded in a 7-coordinate geometry to one O(10), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The U(2)-O(10) bond length is 2.27 Å. The U(2)-O(4) bond length is 2.55 Å. The U(2)-O(5) bond length is 2.56 Å. The U(2)-O(6) bond length is 2.37 Å. The U(2)-O(7) bond length is 2.37 Å. The U(2)-O(8) bond length is 1.80 Å. The U(2)-O(9) bond length is 1.80 Å. In the third U site, U(3) is bonded to one O(11), one O(12), one O(15), two equivalent O(13), and two equivalent O(14) atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent Rb(2)O7 hexagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The U(3)-O(11) bond length is 1.81 Å. The U(3)-O(12) bond length is 1.82 Å. The U(3)-O(15) bond length is 2.30 Å. Both U(3)-O(13) bond lengths are 2.33 Å. Both U(3)-O(14) bond lengths are 2.39 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(13), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one U(3)O7 pentagonal bipyramid. The P(1)-O(13) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.56 Å. The P(1)-O(7) bond length is 1.57 Å. In the second P site, P(2) is bonded to one O(10), one O(14), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one U(3)O7 pentagonal bipyramid. The P(2)-O(10) bond length is 1.54 Å. The P(2)-O(14) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.57 Å. The P(2)-O(5) bond length is 1.58 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Rb(2) and one U(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1) and one U(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one U(1), 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 Rb(1), one U(1), one U(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Rb(1) and one U(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(2) and one U(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one U(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Rb(2) and one U(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Rb(2) and one U(3) atom. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one U(3) and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Rb(1), one U(3), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one U(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Rb(1) and one Rb(2) atom.