RbLa(SeO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(7), one O(8), two equivalent O(6), and three equivalent O(3) atoms. La(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Se(2) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one Se(2) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent La(1), and one Se(1) atom. In the fourth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(2) atom. In the fifth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(1) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent La(1) and one Se(1) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Se(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(2) atom.
RbLa(SeO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(7), one O(8), two equivalent O(6), and three equivalent O(3) atoms. The Rb(1)-O(1) bond length is 3.10 Å. The Rb(1)-O(4) bond length is 2.92 Å. The Rb(1)-O(7) bond length is 3.17 Å. The Rb(1)-O(8) bond length is 3.06 Å. There is one shorter (2.87 Å) and one longer (2.93 Å) Rb(1)-O(6) bond length. There are a spread of Rb(1)-O(3) bond distances ranging from 2.93-3.16 Å. La(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. The La(1)-O(1) bond length is 2.51 Å. The La(1)-O(4) bond length is 2.58 Å. The La(1)-O(8) bond length is 2.55 Å. There is one shorter (2.62 Å) and one longer (2.63 Å) La(1)-O(2) bond length. There is one shorter (2.55 Å) and one longer (2.58 Å) La(1)-O(5) bond length. There is one shorter (2.64 Å) and one longer (2.81 Å) La(1)-O(7) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(7) atom. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(2) bond length is 1.71 Å. The Se(1)-O(3) bond length is 1.64 Å. The Se(1)-O(7) bond length is 1.71 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(8) atom. The Se(2)-O(4) bond length is 1.68 Å. The Se(2)-O(5) bond length is 1.71 Å. The Se(2)-O(6) bond length is 1.64 Å. The Se(2)-O(8) bond length is 1.68 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Se(2) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one Se(2) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent La(1), and one Se(1) atom. In the fourth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(2) atom. In the fifth O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(1) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent La(1) and one Se(1) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one Se(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one La(1), and one Se(2) atom.