Rb3(SeO4)2 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. Se(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 single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one Se(1) atom.
Rb3(SeO4)2 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. Both Rb(1)-O(1) bond lengths are 3.05 Å. Both Rb(1)-O(2) bond lengths are 2.96 Å. Both Rb(1)-O(3) bond lengths are 3.01 Å. All Rb(1)-O(4) bond lengths are 3.42 Å. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(4), three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. The Rb(2)-O(4) bond length is 3.04 Å. There are a spread of Rb(2)-O(1) bond distances ranging from 3.05-3.17 Å. There are a spread of Rb(2)-O(2) bond distances ranging from 3.17-3.22 Å. There are a spread of Rb(2)-O(3) bond distances ranging from 3.11-3.16 Å. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Se(1)-O(1) bond length is 1.68 Å. The Se(1)-O(2) bond length is 1.67 Å. The Se(1)-O(3) bond length is 1.67 Å. The Se(1)-O(4) bond length is 1.69 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one Se(1) atom.