SmPtAs is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing SmAs6Pt6 cuboctahedra. In the second Sm site, Sm(2) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing SmAs6Pt6 cuboctahedra. Pt(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent As(1) atoms. As(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Pt(1) atoms.
SmPtAs is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing SmAs6Pt6 cuboctahedra. All Sm(1)-Pt(1) bond lengths are 3.25 Å. All Sm(1)-As(1) bond lengths are 3.11 Å. In the second Sm site, Sm(2) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing SmAs6Pt6 cuboctahedra. All Sm(2)-Pt(1) bond lengths are 3.10 Å. All Sm(2)-As(1) bond lengths are 3.24 Å. Pt(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent As(1) atoms. All Pt(1)-As(1) bond lengths are 2.49 Å. As(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Pt(1) atoms.