Sm2Sb crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent Sb(1) atoms. In the second Sm site, Sm(2) is bonded to five equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing SmSb5 square pyramids. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1) and five equivalent Sm(2) atoms.
Sm2Sb crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to four equivalent Sb(1) atoms. All Sm(1)-Sb(1) bond lengths are 3.32 Å. In the second Sm site, Sm(2) is bonded to five equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing SmSb5 square pyramids. There is one shorter (3.19 Å) and four longer (3.26 Å) Sm(2)-Sb(1) bond lengths. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1) and five equivalent Sm(2) atoms.