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V3Sn crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. V is bonded in a 6-coordinate geometry to two equivalent V and four equivalent Sn atoms. Both V–V bond lengths are 2.48 Å. All V–Sn bond lengths are 2.78 Å. Sn is bonded to twelve equivalent V atoms to form a mixture of edge and face-sharing SnV12 cuboctahedra.
V3Sn crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent V sites. In the first V site, V is bonded to eight V and four equivalent Sn atoms to form distorted VV8Sn4 cuboctahedra that share corners with four equivalent SnV12 cuboctahedra, corners with fourteen VV8Sn4 cuboctahedra, edges with six equivalent SnV12 cuboctahedra, edges with twelve VV8Sn4 cuboctahedra, faces with four equivalent SnV12 cuboctahedra, and faces with sixteen VV8Sn4 cuboctahedra. There are a spread of V–V bond distances ranging from 2.53–3.12 Å. There are two shorter (2.83 Å) and two longer (2.89 Å) V–Sn bond lengths. In the second V site, V is bonded to eight equivalent V and four equivalent Sn atoms to form distorted VV8Sn4 cuboctahedra that share corners with four equivalent SnV12 cuboctahedra, corners with fourteen VV8Sn4 cuboctahedra, edges with six equivalent SnV12 cuboctahedra, edges with twelve equivalent VV8Sn4 cuboctahedra, faces with four equivalent SnV12 cuboctahedra, and faces with sixteen VV8Sn4 cuboctahedra. There are two shorter (2.83 Å) and two longer (2.89 Å) V–Sn bond lengths. Sn is bonded to twelve V atoms to form SnV12 cuboctahedra that share corners with six equivalent SnV12 cuboctahedra, corners with twelve VV8Sn4 cuboctahedra, edges with eighteen VV8Sn4 cuboctahedra, faces with eight equivalent SnV12 cuboctahedra, and faces with twelve VV8Sn4 cuboctahedra.