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SmSn3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sm is bonded to twelve equivalent Sn atoms to form a mixture of face and corner-sharing SmSn12 cuboctahedra. All Sm–Sn bond lengths are 3.36 Å. Sn is bonded in a distorted square co-planar geometry to four equivalent Sm atoms.
Sm4Sn3 crystallizes in the cubic I-43d space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to six equivalent Sn atoms. There are three shorter (3.16 Å) and three longer (3.42 Å) Sm–Sn bond lengths. Sn is bonded to eight equivalent Sm atoms to form a mixture of distorted edge, face, and corner-sharing SnSm8 hexagonal bipyramids.
SmSn2 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Sm is bonded in a 10-coordinate geometry to ten Sn atoms. There are a spread of Sm–Sn bond distances ranging from 3.22–3.55 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a distorted square co-planar geometry to four equivalent Sm atoms. In the second Sn site, Sn is bonded in a distorted square co-planar geometry to four equivalent Sm atoms. In the third Sn site, Sn is bonded in a 12-coordinate geometry to six equivalent Sm atoms.
Sm5Sn3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Sm–Sn bond lengths are 3.29 Å. In the second Sm site, Sm is bonded in a 5-coordinate geometry to five equivalent Sn atoms. There are a spread of Sm–Sn bond distances ranging from 3.16–3.66 Å. Sn is bonded in a 9-coordinate geometry to nine Sm atoms.