Rb3SbF12 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a cuboctahedral geometry to four equivalent F(1), four equivalent F(2), and four equivalent F(3) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to two equivalent F(1) and six equivalent F(3) atoms. Sb(1) is bonded in a body-centered cubic geometry to four equivalent F(1) and four equivalent F(2) atoms. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), and one Sb(1) atom. In the second F site, F(2) is bonded in a single-bond geometry to one Rb(1) and one Sb(1) atom. In the third F site, F(3) is bonded to one Rb(1) and three equivalent Rb(2) atoms to form a mixture of face, corner, and edge-sharing FRb4 trigonal pyramids.
Rb3SbF12 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a cuboctahedral geometry to four equivalent F(1), four equivalent F(2), and four equivalent F(3) atoms. All Rb(1)-F(1) bond lengths are 2.85 Å. All Rb(1)-F(2) bond lengths are 3.11 Å. All Rb(1)-F(3) bond lengths are 2.93 Å. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to two equivalent F(1) and six equivalent F(3) atoms. Both Rb(2)-F(1) bond lengths are 2.70 Å. There are a spread of Rb(2)-F(3) bond distances ranging from 3.10-3.25 Å. Sb(1) is bonded in a body-centered cubic geometry to four equivalent F(1) and four equivalent F(2) atoms. All Sb(1)-F(1) bond lengths are 1.97 Å. All Sb(1)-F(2) bond lengths are 2.17 Å. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), and one Sb(1) atom. In the second F site, F(2) is bonded in a single-bond geometry to one Rb(1) and one Sb(1) atom. In the third F site, F(3) is bonded to one Rb(1) and three equivalent Rb(2) atoms to form a mixture of face, corner, and edge-sharing FRb4 trigonal pyramids.