Sm2Tl crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 14-coordinate geometry to two equivalent Sm(1), six equivalent Sm(2), and six equivalent Tl(1) atoms. In the second Sm site, Sm(2) is bonded to six equivalent Sm(1) and five equivalent Tl(1) atoms to form a mixture of distorted corner and face-sharing SmSm6Tl5 trigonal bipyramids. Tl(1) is bonded in a 11-coordinate geometry to five equivalent Sm(2) and six equivalent Sm(1) atoms.
Sm2Tl crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 14-coordinate geometry to two equivalent Sm(1), six equivalent Sm(2), and six equivalent Tl(1) atoms. Both Sm(1)-Sm(1) bond lengths are 3.41 Å. All Sm(1)-Sm(2) bond lengths are 3.60 Å. All Sm(1)-Tl(1) bond lengths are 3.60 Å. In the second Sm site, Sm(2) is bonded to six equivalent Sm(1) and five equivalent Tl(1) atoms to form a mixture of distorted corner and face-sharing SmSm6Tl5 trigonal bipyramids. There are three shorter (3.17 Å) and two longer (3.41 Å) Sm(2)-Tl(1) bond lengths. Tl(1) is bonded in a 11-coordinate geometry to five equivalent Sm(2) and six equivalent Sm(1) atoms.