RbK2BiSe3 crystallizes in the cubic P2_13 space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. Bi(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se(1) atoms. Se(1) is bonded to two equivalent Rb(1), two equivalent K(1), two equivalent K(2), and one Bi(1) atom to form a mixture of distorted edge, face, and corner-sharing SeK4Rb2Bi pentagonal bipyramids.
RbK2BiSe3 crystallizes in the cubic P2_13 space group. Rb(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are three shorter (3.61 Å) and three longer (3.66 Å) Rb(1)-Se(1) bond lengths. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are three shorter (3.36 Å) and three longer (3.54 Å) K(1)-Se(1) bond lengths. In the second K site, K(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are three shorter (3.37 Å) and three longer (3.53 Å) K(2)-Se(1) bond lengths. Bi(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se(1) atoms. All Bi(1)-Se(1) bond lengths are 2.70 Å. Se(1) is bonded to two equivalent Rb(1), two equivalent K(1), two equivalent K(2), and one Bi(1) atom to form a mixture of distorted edge, face, and corner-sharing SeK4Rb2Bi pentagonal bipyramids.