CsRb3 crystallizes in the tetragonal I4/mmm space group. Cs(1) is bonded to four equivalent Rb(2) and eight equivalent Rb(1) atoms to form a mixture of face, corner, and edge-sharing CsRb12 cuboctahedra. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to four equivalent Cs(1) atoms. In the second Rb site, Rb(2) is bonded in a square co-planar geometry to four equivalent Cs(1) atoms.
CsRb3 crystallizes in the tetragonal I4/mmm space group. Cs(1) is bonded to four equivalent Rb(2) and eight equivalent Rb(1) atoms to form a mixture of face, corner, and edge-sharing CsRb12 cuboctahedra. All Cs(1)-Rb(2) bond lengths are 5.23 Å. All Cs(1)-Rb(1) bond lengths are 5.24 Å. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to four equivalent Cs(1) atoms. In the second Rb site, Rb(2) is bonded in a square co-planar geometry to four equivalent Cs(1) atoms.