RbSeO4 crystallizes in the triclinic P1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one O(12), one O(2), one O(3), one O(5), one O(8), one O(9), two equivalent O(6), and two equivalent O(7) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(4), one O(5), one O(7), one O(9), two equivalent O(10), and two equivalent O(12) atoms. In the third Rb site, Rb(3) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(11), one O(4), one O(5), and one O(7) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(3), and one O(6) atom. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(12), one O(2), one O(8), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), and one Se(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(3), and one Se(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), and one Se(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Rb(2), two equivalent Rb(3), and one Se(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1), one Rb(2), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Rb(3), two equivalent Rb(1), and one Se(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Rb(2), two equivalent Rb(1), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), and one Se(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Se(3) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Rb(3), two equivalent Rb(2), and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), and one Se(1) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(2), and one Se(3) atom.
RbSeO4 crystallizes in the triclinic P1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one O(12), one O(2), one O(3), one O(5), one O(8), one O(9), two equivalent O(6), and two equivalent O(7) atoms. The Rb(1)-O(12) bond length is 3.28 Å. The Rb(1)-O(2) bond length is 3.25 Å. The Rb(1)-O(3) bond length is 3.16 Å. The Rb(1)-O(5) bond length is 3.21 Å. The Rb(1)-O(8) bond length is 3.15 Å. The Rb(1)-O(9) bond length is 3.17 Å. There is one shorter (2.86 Å) and one longer (3.22 Å) Rb(1)-O(6) bond length. There is one shorter (2.87 Å) and one longer (3.33 Å) Rb(1)-O(7) bond length. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(4), one O(5), one O(7), one O(9), two equivalent O(10), and two equivalent O(12) atoms. The Rb(2)-O(1) bond length is 3.09 Å. The Rb(2)-O(11) bond length is 3.01 Å. The Rb(2)-O(4) bond length is 3.54 Å. The Rb(2)-O(5) bond length is 3.42 Å. The Rb(2)-O(7) bond length is 3.11 Å. The Rb(2)-O(9) bond length is 3.19 Å. There is one shorter (2.90 Å) and one longer (3.41 Å) Rb(2)-O(10) bond length. There is one shorter (2.90 Å) and one longer (3.10 Å) Rb(2)-O(12) bond length. In the third Rb site, Rb(3) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. The Rb(3)-O(1) bond length is 3.01 Å. The Rb(3)-O(10) bond length is 3.53 Å. The Rb(3)-O(11) bond length is 3.10 Å. The Rb(3)-O(3) bond length is 3.40 Å. The Rb(3)-O(6) bond length is 3.14 Å. The Rb(3)-O(8) bond length is 3.23 Å. There is one shorter (2.91 Å) and one longer (3.08 Å) Rb(3)-O(2) bond length. There is one shorter (2.88 Å) and one longer (3.39 Å) Rb(3)-O(4) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(11), one O(4), one O(5), and one O(7) atom. The Se(1)-O(11) bond length is 1.72 Å. The Se(1)-O(4) bond length is 1.65 Å. The Se(1)-O(5) bond length is 1.72 Å. The Se(1)-O(7) bond length is 1.65 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(3), and one O(6) atom. The Se(2)-O(1) bond length is 1.71 Å. The Se(2)-O(10) bond length is 1.65 Å. The Se(2)-O(3) bond length is 1.72 Å. The Se(2)-O(6) bond length is 1.66 Å. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(12), one O(2), one O(8), and one O(9) atom. The Se(3)-O(12) bond length is 1.65 Å. The Se(3)-O(2) bond length is 1.65 Å. The Se(3)-O(8) bond length is 1.72 Å. The Se(3)-O(9) bond length is 1.72 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), and one Se(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(3), and one Se(3) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), and one Se(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Rb(2), two equivalent Rb(3), and one Se(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1), one Rb(2), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Rb(3), two equivalent Rb(1), and one Se(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Rb(2), two equivalent Rb(1), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(3), and one Se(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Se(3) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Rb(3), two equivalent Rb(2), and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), and one Se(1) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(2), and one Se(3) atom.