U2(GeSi)3 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Pmmm space group. U(1) is bonded to two equivalent Ge(2), four equivalent Ge(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form USi6Ge6 cuboctahedra that share corners with twelve equivalent U(1)Si6Ge6 cuboctahedra, edges with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with two equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with two equivalent Si(2)U4Ge8 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with six equivalent U(1)Si6Ge6 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent U(1), two equivalent Ge(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form distorted GeU4Si6Ge2 cuboctahedra that share corners with twelve equivalent Ge(1)U4Si6Ge2 cuboctahedra, edges with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, faces with two equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with two equivalent Si(2)U4Ge8 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, and faces with six equivalent Ge(1)U4Si6Ge2 cuboctahedra. In the second Ge site, Ge(2) is bonded to four equivalent U(1), four equivalent Ge(1), and four equivalent Si(2) atoms to form distorted GeU4Si4Ge4 cuboctahedra that share corners with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, faces with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with four equivalent Si(2)U4Ge8 cuboctahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Ge(1) atoms. In the second Si site, Si(2) is bonded to four equivalent U(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form SiU4Ge8 cuboctahedra that share corners with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, faces with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with four equivalent Si(2)U4Ge8 cuboctahedra. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Ge(1) atoms.
U2(GeSi)3 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Pmmm space group. U(1) is bonded to two equivalent Ge(2), four equivalent Ge(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form USi6Ge6 cuboctahedra that share corners with twelve equivalent U(1)Si6Ge6 cuboctahedra, edges with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with two equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with two equivalent Si(2)U4Ge8 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with six equivalent U(1)Si6Ge6 cuboctahedra. Both U(1)-Ge(2) bond lengths are 2.93 Å. All U(1)-Ge(1) bond lengths are 2.92 Å. Both U(1)-Si(1) bond lengths are 2.89 Å. Both U(1)-Si(2) bond lengths are 2.93 Å. Both U(1)-Si(3) bond lengths are 2.88 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent U(1), two equivalent Ge(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form distorted GeU4Si6Ge2 cuboctahedra that share corners with twelve equivalent Ge(1)U4Si6Ge2 cuboctahedra, edges with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, faces with two equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with two equivalent Si(2)U4Ge8 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, and faces with six equivalent Ge(1)U4Si6Ge2 cuboctahedra. Both Ge(1)-Ge(2) bond lengths are 2.93 Å. Both Ge(1)-Si(1) bond lengths are 2.87 Å. Both Ge(1)-Si(2) bond lengths are 2.94 Å. Both Ge(1)-Si(3) bond lengths are 2.88 Å. In the second Ge site, Ge(2) is bonded to four equivalent U(1), four equivalent Ge(1), and four equivalent Si(2) atoms to form distorted GeU4Si4Ge4 cuboctahedra that share corners with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, faces with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with four equivalent Si(2)U4Ge8 cuboctahedra. All Ge(2)-Si(2) bond lengths are 2.92 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Ge(1) atoms. In the second Si site, Si(2) is bonded to four equivalent U(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form SiU4Ge8 cuboctahedra that share corners with four equivalent Si(2)U4Ge8 cuboctahedra, edges with eight equivalent U(1)Si6Ge6 cuboctahedra, edges with eight equivalent Ge(1)U4Si6Ge2 cuboctahedra, faces with four equivalent U(1)Si6Ge6 cuboctahedra, faces with four equivalent Ge(2)U4Si4Ge4 cuboctahedra, faces with four equivalent Ge(1)U4Si6Ge2 cuboctahedra, and faces with four equivalent Si(2)U4Ge8 cuboctahedra. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Ge(1) atoms.