U2Co3Ge is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Cmcm space group. U(1) is bonded in a 13-coordinate geometry to one U(1), three equivalent Co(1), six equivalent Co(2), and three equivalent Ge(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent U(1), four equivalent Co(2), and two equivalent Ge(1) atoms to form distorted CoU6Co4Ge2 cuboctahedra that share corners with four equivalent Ge(1)U6Co6 cuboctahedra, corners with six equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with eight equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Co(1)U6Co4Ge2 cuboctahedra, faces with six equivalent Ge(1)U6Co6 cuboctahedra, and faces with twelve equivalent Co(2)U6Co4Ge2 cuboctahedra. In the second Co site, Co(2) is bonded to six equivalent U(1), two equivalent Co(1), two equivalent Co(2), and two equivalent Ge(1) atoms to form distorted CoU6Co4Ge2 cuboctahedra that share corners with four equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with four equivalent Ge(1)U6Co6 cuboctahedra, corners with ten equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Co(2)U6Co4Ge2 cuboctahedra, faces with six equivalent Co(1)U6Co4Ge2 cuboctahedra, faces with six equivalent Co(2)U6Co4Ge2 cuboctahedra, and faces with six equivalent Ge(1)U6Co6 cuboctahedra. Ge(1) is bonded to six equivalent U(1), two equivalent Co(1), and four equivalent Co(2) atoms to form GeU6Co6 cuboctahedra that share corners with four equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with eight equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Ge(1)U6Co6 cuboctahedra, faces with two equivalent Ge(1)U6Co6 cuboctahedra, faces with six equivalent Co(1)U6Co4Ge2 cuboctahedra, and faces with twelve equivalent Co(2)U6Co4Ge2 cuboctahedra.
U2Co3Ge is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Cmcm space group. U(1) is bonded in a 13-coordinate geometry to one U(1), three equivalent Co(1), six equivalent Co(2), and three equivalent Ge(1) atoms. The U(1)-U(1) bond length is 2.70 Å. There is one shorter (2.85 Å) and two longer (2.92 Å) U(1)-Co(1) bond lengths. There are a spread of U(1)-Co(2) bond distances ranging from 2.85-2.93 Å. There are two shorter (3.04 Å) and one longer (3.05 Å) U(1)-Ge(1) bond length. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to six equivalent U(1), four equivalent Co(2), and two equivalent Ge(1) atoms to form distorted CoU6Co4Ge2 cuboctahedra that share corners with four equivalent Ge(1)U6Co6 cuboctahedra, corners with six equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with eight equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Co(1)U6Co4Ge2 cuboctahedra, faces with six equivalent Ge(1)U6Co6 cuboctahedra, and faces with twelve equivalent Co(2)U6Co4Ge2 cuboctahedra. There are two shorter (2.53 Å) and two longer (2.65 Å) Co(1)-Co(2) bond lengths. Both Co(1)-Ge(1) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded to six equivalent U(1), two equivalent Co(1), two equivalent Co(2), and two equivalent Ge(1) atoms to form distorted CoU6Co4Ge2 cuboctahedra that share corners with four equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with four equivalent Ge(1)U6Co6 cuboctahedra, corners with ten equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Co(2)U6Co4Ge2 cuboctahedra, faces with six equivalent Co(1)U6Co4Ge2 cuboctahedra, faces with six equivalent Co(2)U6Co4Ge2 cuboctahedra, and faces with six equivalent Ge(1)U6Co6 cuboctahedra. There is one shorter (2.53 Å) and one longer (2.65 Å) Co(2)-Co(2) bond length. Both Co(2)-Ge(1) bond lengths are 2.44 Å. Ge(1) is bonded to six equivalent U(1), two equivalent Co(1), and four equivalent Co(2) atoms to form GeU6Co6 cuboctahedra that share corners with four equivalent Co(1)U6Co4Ge2 cuboctahedra, corners with eight equivalent Co(2)U6Co4Ge2 cuboctahedra, edges with six equivalent Ge(1)U6Co6 cuboctahedra, faces with two equivalent Ge(1)U6Co6 cuboctahedra, faces with six equivalent Co(1)U6Co4Ge2 cuboctahedra, and faces with twelve equivalent Co(2)U6Co4Ge2 cuboctahedra.