Y4PtGa12 crystallizes in the cubic Im-3m space group. Y(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form YGa12 cuboctahedra that share corners with twelve equivalent Y(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(2)Y4Ga8 cuboctahedra, faces with six equivalent Y(1)Ga12 cuboctahedra, faces with six equivalent Ga(2)Y4Ga8 cuboctahedra, and faces with two equivalent Pt(1)Ga6 octahedra. Pt(1) is bonded to six equivalent Ga(1) atoms to form PtGa6 octahedra that share corners with twenty-four equivalent Ga(2)Y4Ga8 cuboctahedra and faces with eight equivalent Y(1)Ga12 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Y(1), one Pt(1), and four equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded to four equivalent Y(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaY4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Y4Ga8 cuboctahedra, corners with four equivalent Pt(1)Ga6 octahedra, edges with eight equivalent Y(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Y4Ga8 cuboctahedra, faces with four equivalent Y(1)Ga12 cuboctahedra, and faces with six equivalent Ga(2)Y4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°.
Y4PtGa12 crystallizes in the cubic Im-3m space group. Y(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form YGa12 cuboctahedra that share corners with twelve equivalent Y(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(2)Y4Ga8 cuboctahedra, faces with six equivalent Y(1)Ga12 cuboctahedra, faces with six equivalent Ga(2)Y4Ga8 cuboctahedra, and faces with two equivalent Pt(1)Ga6 octahedra. All Y(1)-Ga(1) bond lengths are 3.06 Å. All Y(1)-Ga(2) bond lengths are 3.03 Å. Pt(1) is bonded to six equivalent Ga(1) atoms to form PtGa6 octahedra that share corners with twenty-four equivalent Ga(2)Y4Ga8 cuboctahedra and faces with eight equivalent Y(1)Ga12 cuboctahedra. All Pt(1)-Ga(1) bond lengths are 2.55 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Y(1), one Pt(1), and four equivalent Ga(2) atoms. All Ga(1)-Ga(2) bond lengths are 2.76 Å. In the second Ga site, Ga(2) is bonded to four equivalent Y(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaY4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Y4Ga8 cuboctahedra, corners with four equivalent Pt(1)Ga6 octahedra, edges with eight equivalent Y(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Y4Ga8 cuboctahedra, faces with four equivalent Y(1)Ga12 cuboctahedra, and faces with six equivalent Ga(2)Y4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°. All Ga(2)-Ga(2) bond lengths are 3.03 Å.