Rb2U3(O5F4)2 crystallizes in the orthorhombic Ama2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), two equivalent F(3), and two equivalent F(4) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(5), one O(6), one O(7), two equivalent F(1), and two equivalent F(3) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(1), one O(2), one F(1), one F(3), one F(4), and two equivalent F(2) atoms to form distorted UO2F5 pentagonal bipyramids that share corners with two equivalent U(1)O2F5 pentagonal bipyramids and corners with two equivalent U(2)O3F4 pentagonal bipyramids. In the second U site, U(2) is bonded to one O(4), two equivalent O(3), two equivalent F(1), and two equivalent F(4) atoms to form distorted corner-sharing UO3F4 pentagonal bipyramids. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a single-bond geometry to one U(2) atom. In the second O site, O(5) is bonded in an L-shaped geometry to one Rb(1) and one Rb(2) atom. In the third O site, O(6) is bonded in a water-like geometry to one Rb(1) and one Rb(2) atom. In the fourth O site, O(7) is bonded in a bent 120 degrees geometry to one Rb(1) and one Rb(2) atom. In the fifth O site, O(1) is bonded in a single-bond geometry to one Rb(1) and one U(1) atom. In the sixth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the seventh O site, O(3) is bonded in a single-bond geometry to one Rb(1) and one U(2) atom. There are four inequivalent F sites. In the first F site, F(2) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the second F site, F(3) is bonded in a distorted trigonal planar geometry to one Rb(1), one Rb(2), and one U(1) atom. In the third F site, F(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one U(1), and one U(2) atom. In the fourth F site, F(1) is bonded in a distorted trigonal planar geometry to one Rb(2), one U(1), and one U(2) atom.
Rb2U3(O5F4)2 crystallizes in the orthorhombic Ama2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), two equivalent F(3), and two equivalent F(4) atoms. The Rb(1)-O(5) bond length is 3.23 Å. The Rb(1)-O(6) bond length is 3.13 Å. The Rb(1)-O(7) bond length is 2.97 Å. Both Rb(1)-O(1) bond lengths are 3.17 Å. Both Rb(1)-O(3) bond lengths are 3.32 Å. Both Rb(1)-F(3) bond lengths are 2.85 Å. Both Rb(1)-F(4) bond lengths are 3.12 Å. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(5), one O(6), one O(7), two equivalent F(1), and two equivalent F(3) atoms. The Rb(2)-O(5) bond length is 3.17 Å. The Rb(2)-O(6) bond length is 3.12 Å. The Rb(2)-O(7) bond length is 3.00 Å. Both Rb(2)-F(1) bond lengths are 2.96 Å. Both Rb(2)-F(3) bond lengths are 2.80 Å. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(1), one O(2), one F(1), one F(3), one F(4), and two equivalent F(2) atoms to form distorted UO2F5 pentagonal bipyramids that share corners with two equivalent U(1)O2F5 pentagonal bipyramids and corners with two equivalent U(2)O3F4 pentagonal bipyramids. The U(1)-O(1) bond length is 1.82 Å. The U(1)-O(2) bond length is 1.80 Å. The U(1)-F(1) bond length is 2.46 Å. The U(1)-F(3) bond length is 2.18 Å. The U(1)-F(4) bond length is 2.36 Å. There is one shorter (2.33 Å) and one longer (2.35 Å) U(1)-F(2) bond length. In the second U site, U(2) is bonded to one O(4), two equivalent O(3), two equivalent F(1), and two equivalent F(4) atoms to form distorted corner-sharing UO3F4 pentagonal bipyramids. The U(2)-O(4) bond length is 2.44 Å. Both U(2)-O(3) bond lengths are 1.81 Å. Both U(2)-F(1) bond lengths are 2.31 Å. Both U(2)-F(4) bond lengths are 2.29 Å. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a single-bond geometry to one U(2) atom. In the second O site, O(5) is bonded in an L-shaped geometry to one Rb(1) and one Rb(2) atom. In the third O site, O(6) is bonded in a water-like geometry to one Rb(1) and one Rb(2) atom. In the fourth O site, O(7) is bonded in a bent 120 degrees geometry to one Rb(1) and one Rb(2) atom. In the fifth O site, O(1) is bonded in a single-bond geometry to one Rb(1) and one U(1) atom. In the sixth O site, O(2) is bonded in a single-bond geometry to one U(1) atom. In the seventh O site, O(3) is bonded in a single-bond geometry to one Rb(1) and one U(2) atom. There are four inequivalent F sites. In the first F site, F(2) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the second F site, F(3) is bonded in a distorted trigonal planar geometry to one Rb(1), one Rb(2), and one U(1) atom. In the third F site, F(4) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one U(1), and one U(2) atom. In the fourth F site, F(1) is bonded in a distorted trigonal planar geometry to one Rb(2), one U(1), and one U(2) atom.