RbLu(SO4)2 crystallizes in the monoclinic P2/c space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(4), and six equivalent O(2) atoms. Lu(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. S(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Lu(1), and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one S(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(1), one Lu(1), and one S(1) atom.
RbLu(SO4)2 crystallizes in the monoclinic P2/c space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(4), and six equivalent O(2) atoms. Both Rb(1)-O(1) bond lengths are 3.13 Å. Both Rb(1)-O(4) bond lengths are 3.15 Å. There are a spread of Rb(1)-O(2) bond distances ranging from 3.02-3.14 Å. Lu(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. Both Lu(1)-O(1) bond lengths are 2.22 Å. Both Lu(1)-O(4) bond lengths are 2.32 Å. There are two shorter (2.33 Å) and two longer (2.43 Å) Lu(1)-O(3) bond lengths. S(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The S(1)-O(1) bond length is 1.49 Å. The S(1)-O(2) bond length is 1.45 Å. The S(1)-O(3) bond length is 1.52 Å. The S(1)-O(4) bond length is 1.50 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Lu(1), and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one S(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Rb(1), one Lu(1), and one S(1) atom.