Rb2W3SeO12 crystallizes in the hexagonal P6_3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to three equivalent O(2) and three equivalent O(3) atoms. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 31-46°. Se(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one W(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(2) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms.
Rb2W3SeO12 crystallizes in the hexagonal P6_3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. All Rb(1)-O(1) bond lengths are 3.00 Å. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to three equivalent O(2) and three equivalent O(3) atoms. All Rb(2)-O(2) bond lengths are 3.03 Å. All Rb(2)-O(3) bond lengths are 2.89 Å. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 31-46°. The W(1)-O(1) bond length is 2.17 Å. The W(1)-O(3) bond length is 1.74 Å. There is one shorter (1.89 Å) and one longer (1.99 Å) W(1)-O(2) bond length. There is one shorter (1.87 Å) and one longer (1.98 Å) W(1)-O(4) bond length. Se(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. All Se(1)-O(1) bond lengths are 1.72 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one W(1), and one Se(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(2) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms.