SmMn2 is Hexagonal Laves structured and crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Sm(1), three equivalent Mn(1), three equivalent Mn(3), and six equivalent Mn(2) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to six equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra. In the second Mn site, Mn(2) is bonded to six equivalent Sm(1), two equivalent Mn(1), two equivalent Mn(2), and two equivalent Mn(3) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra. In the third Mn site, Mn(3) is bonded to six equivalent Sm(1), two equivalent Mn(1), and four equivalent Mn(2) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra.
SmMn2 is Hexagonal Laves structured and crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 16-coordinate geometry to four equivalent Sm(1), three equivalent Mn(1), three equivalent Mn(3), and six equivalent Mn(2) atoms. There is one shorter (3.11 Å) and three longer (3.35 Å) Sm(1)-Sm(1) bond lengths. There is one shorter (2.98 Å) and two longer (3.18 Å) Sm(1)-Mn(1) bond lengths. There is one shorter (3.21 Å) and two longer (3.24 Å) Sm(1)-Mn(3) bond lengths. There are a spread of Sm(1)-Mn(2) bond distances ranging from 3.02-3.22 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to six equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra. Both Mn(1)-Mn(3) bond lengths are 2.64 Å. All Mn(1)-Mn(2) bond lengths are 2.74 Å. In the second Mn site, Mn(2) is bonded to six equivalent Sm(1), two equivalent Mn(1), two equivalent Mn(2), and two equivalent Mn(3) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra. There is one shorter (2.70 Å) and one longer (2.85 Å) Mn(2)-Mn(2) bond length. There is one shorter (2.57 Å) and one longer (2.61 Å) Mn(2)-Mn(3) bond length. In the third Mn site, Mn(3) is bonded to six equivalent Sm(1), two equivalent Mn(1), and four equivalent Mn(2) atoms to form a mixture of edge, corner, and face-sharing MnSm6Mn6 cuboctahedra.