SmY(Co2Ni3)2 crystallizes in the orthorhombic Pmmm space group. Sm(1) is bonded in a 18-coordinate geometry to two equivalent Co(1), four equivalent Co(2), four equivalent Ni(1), and eight equivalent Ni(3) atoms. Y(1) is bonded in a 18-coordinate geometry to two equivalent Co(2), four equivalent Co(1), four equivalent Ni(2), and eight equivalent Ni(3) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Y(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), one Y(1), two equivalent Ni(1), and four equivalent Ni(3) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Sm(1), four equivalent Co(2), and four equivalent Ni(3) atoms to form NiSm4Co4Ni4 cuboctahedra that share corners with four equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with four equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, edges with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, and faces with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Y(1), four equivalent Co(1), and four equivalent Ni(3) atoms to form NiY4Co4Ni4 cuboctahedra that share corners with four equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with four equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, edges with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, and faces with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Sm(1), two equivalent Y(1), two equivalent Co(1), two equivalent Co(2), one Ni(1), one Ni(2), and two equivalent Ni(3) atoms to form NiSm2Y2Co4Ni4 cuboctahedra that share corners with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with twelve equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, edges with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, edges with six equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, faces with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, and faces with six equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra.
SmY(Co2Ni3)2 crystallizes in the orthorhombic Pmmm space group. Sm(1) is bonded in a 18-coordinate geometry to two equivalent Co(1), four equivalent Co(2), four equivalent Ni(1), and eight equivalent Ni(3) atoms. Both Sm(1)-Co(1) bond lengths are 2.83 Å. All Sm(1)-Co(2) bond lengths are 2.83 Å. All Sm(1)-Ni(1) bond lengths are 3.16 Å. All Sm(1)-Ni(3) bond lengths are 3.16 Å. Y(1) is bonded in a 18-coordinate geometry to two equivalent Co(2), four equivalent Co(1), four equivalent Ni(2), and eight equivalent Ni(3) atoms. Both Y(1)-Co(2) bond lengths are 2.83 Å. All Y(1)-Co(1) bond lengths are 2.83 Å. All Y(1)-Ni(2) bond lengths are 3.16 Å. All Y(1)-Ni(3) bond lengths are 3.15 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Y(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. Both Co(1)-Ni(2) bond lengths are 2.43 Å. All Co(1)-Ni(3) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), one Y(1), two equivalent Ni(1), and four equivalent Ni(3) atoms. Both Co(2)-Ni(1) bond lengths are 2.44 Å. All Co(2)-Ni(3) bond lengths are 2.44 Å. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Sm(1), four equivalent Co(2), and four equivalent Ni(3) atoms to form NiSm4Co4Ni4 cuboctahedra that share corners with four equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with four equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, edges with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, and faces with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra. All Ni(1)-Ni(3) bond lengths are 2.45 Å. In the second Ni site, Ni(2) is bonded to four equivalent Y(1), four equivalent Co(1), and four equivalent Ni(3) atoms to form NiY4Co4Ni4 cuboctahedra that share corners with four equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with four equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, edges with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, and faces with eight equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra. All Ni(2)-Ni(3) bond lengths are 2.45 Å. In the third Ni site, Ni(3) is bonded to two equivalent Sm(1), two equivalent Y(1), two equivalent Co(1), two equivalent Co(2), one Ni(1), one Ni(2), and two equivalent Ni(3) atoms to form NiSm2Y2Co4Ni4 cuboctahedra that share corners with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, corners with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, corners with twelve equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, edges with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, edges with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, edges with six equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra, faces with two equivalent Ni(1)Sm4Co4Ni4 cuboctahedra, faces with two equivalent Ni(2)Y4Co4Ni4 cuboctahedra, and faces with six equivalent Ni(3)Sm2Y2Co4Ni4 cuboctahedra. There is one shorter (2.45 Å) and one longer (2.46 Å) Ni(3)-Ni(3) bond length.