Rb2AlTb3F16 crystallizes in the hexagonal P6_3/mmc space group. Rb(1) is bonded in a 12-coordinate geometry to three equivalent F(1), three equivalent F(2), and six equivalent F(3) atoms. Tb(1) is bonded in a 7-coordinate geometry to one F(4), two equivalent F(1), and four equivalent F(3) atoms. Al(1) is bonded in an octahedral geometry to six equivalent F(2) atoms. There are four inequivalent F sites. In the first F site, F(1) is bonded to two equivalent Rb(1) and two equivalent Tb(1) atoms to form a mixture of distorted edge and corner-sharing FRb2Tb2 tetrahedra. In the second F site, F(2) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom. In the third F site, F(3) is bonded to two equivalent Rb(1) and two equivalent Tb(1) atoms to form a mixture of distorted edge and corner-sharing FRb2Tb2 tetrahedra. In the fourth F site, F(4) is bonded in a trigonal planar geometry to three equivalent Tb(1) atoms.
Rb2AlTb3F16 crystallizes in the hexagonal P6_3/mmc space group. Rb(1) is bonded in a 12-coordinate geometry to three equivalent F(1), three equivalent F(2), and six equivalent F(3) atoms. All Rb(1)-F(1) bond lengths are 3.15 Å. All Rb(1)-F(2) bond lengths are 2.89 Å. There are three shorter (3.11 Å) and three longer (3.16 Å) Rb(1)-F(3) bond lengths. Tb(1) is bonded in a 7-coordinate geometry to one F(4), two equivalent F(1), and four equivalent F(3) atoms. The Tb(1)-F(4) bond length is 2.26 Å. Both Tb(1)-F(1) bond lengths are 2.37 Å. All Tb(1)-F(3) bond lengths are 2.28 Å. Al(1) is bonded in an octahedral geometry to six equivalent F(2) atoms. All Al(1)-F(2) bond lengths are 1.82 Å. There are four inequivalent F sites. In the first F site, F(1) is bonded to two equivalent Rb(1) and two equivalent Tb(1) atoms to form a mixture of distorted edge and corner-sharing FRb2Tb2 tetrahedra. In the second F site, F(2) is bonded in a distorted single-bond geometry to one Rb(1) and one Al(1) atom. In the third F site, F(3) is bonded to two equivalent Rb(1) and two equivalent Tb(1) atoms to form a mixture of distorted edge and corner-sharing FRb2Tb2 tetrahedra. In the fourth F site, F(4) is bonded in a trigonal planar geometry to three equivalent Tb(1) atoms.