Rb4Li(Se2O7)2 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(6), one O(7), and one O(8) atom. In the fourth Rb site, Rb(4) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(14), one O(2), one O(4), one O(5), and one O(7) atom. Li(1) is bonded in a trigonal planar geometry to one O(1), one O(11), and one O(8) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(13), one O(5), and one O(9) atom to form corner-sharing SeO4 tetrahedra. In the second Se site, Se(2) is bonded to one O(10), one O(13), one O(2), and one O(6) atom to form corner-sharing SeO4 tetrahedra. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(11), one O(14), one O(3), and one O(7) atom. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(12), one O(4), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(3), one Rb(4), one Li(1), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), one Rb(4), and one Se(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), one Rb(4), and one Se(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Li(1), and one Se(4) 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(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Rb(2) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Li(1) and one Se(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Se(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Rb(4) and one Se(3) atom.
Rb4Li(Se2O7)2 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. The Rb(1)-O(12) bond length is 3.25 Å. The Rb(1)-O(3) bond length is 2.98 Å. The Rb(1)-O(4) bond length is 3.08 Å. The Rb(1)-O(5) bond length is 3.14 Å. The Rb(1)-O(6) bond length is 3.00 Å. The Rb(1)-O(8) bond length is 3.17 Å. The Rb(1)-O(9) bond length is 2.87 Å. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. The Rb(2)-O(10) bond length is 2.98 Å. The Rb(2)-O(12) bond length is 3.13 Å. The Rb(2)-O(2) bond length is 3.29 Å. The Rb(2)-O(3) bond length is 2.95 Å. The Rb(2)-O(5) bond length is 3.27 Å. The Rb(2)-O(6) bond length is 3.37 Å. The Rb(2)-O(7) bond length is 3.21 Å. The Rb(2)-O(9) bond length is 3.14 Å. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(6), one O(7), and one O(8) atom. The Rb(3)-O(1) bond length is 3.07 Å. The Rb(3)-O(2) bond length is 3.18 Å. The Rb(3)-O(6) bond length is 2.88 Å. The Rb(3)-O(7) bond length is 2.95 Å. The Rb(3)-O(8) bond length is 2.93 Å. In the fourth Rb site, Rb(4) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(14), one O(2), one O(4), one O(5), and one O(7) atom. The Rb(4)-O(1) bond length is 2.98 Å. The Rb(4)-O(12) bond length is 2.99 Å. The Rb(4)-O(14) bond length is 2.94 Å. The Rb(4)-O(2) bond length is 2.97 Å. The Rb(4)-O(4) bond length is 3.11 Å. The Rb(4)-O(5) bond length is 2.86 Å. The Rb(4)-O(7) bond length is 3.12 Å. Li(1) is bonded in a trigonal planar geometry to one O(1), one O(11), and one O(8) atom. The Li(1)-O(1) bond length is 1.98 Å. The Li(1)-O(11) bond length is 1.86 Å. The Li(1)-O(8) bond length is 1.87 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(13), one O(5), and one O(9) atom to form corner-sharing SeO4 tetrahedra. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(13) bond length is 1.81 Å. The Se(1)-O(5) bond length is 1.65 Å. The Se(1)-O(9) bond length is 1.64 Å. In the second Se site, Se(2) is bonded to one O(10), one O(13), one O(2), and one O(6) atom to form corner-sharing SeO4 tetrahedra. The Se(2)-O(10) bond length is 1.63 Å. The Se(2)-O(13) bond length is 1.90 Å. The Se(2)-O(2) bond length is 1.65 Å. The Se(2)-O(6) bond length is 1.65 Å. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(11), one O(14), one O(3), and one O(7) atom. The Se(3)-O(11) bond length is 1.68 Å. The Se(3)-O(14) bond length is 1.70 Å. The Se(3)-O(3) bond length is 1.67 Å. The Se(3)-O(7) bond length is 1.67 Å. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(12), one O(4), and one O(8) atom. The Se(4)-O(12) bond length is 1.69 Å. The Se(4)-O(4) bond length is 1.70 Å. The Se(4)-O(8) bond length is 1.71 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(3), one Rb(4), one Li(1), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), one Rb(4), and one Se(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), one Rb(4), and one Se(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Li(1), and one Se(4) 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(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Rb(2) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Li(1) and one Se(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Se(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Rb(4) and one Se(3) atom.