YCo4Ge crystallizes in the orthorhombic Cmmm space group. Y(1) is bonded in a 18-coordinate geometry to six equivalent Co(1), eight equivalent Co(2), and four equivalent Ge(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), four equivalent Co(2), and two equivalent Ge(1) atoms. In the second Co site, Co(2) is bonded to four equivalent Y(1), two equivalent Co(2), four equivalent Co(1), and two equivalent Ge(1) atoms to form distorted CoY4Co6Ge2 cuboctahedra that share corners with four equivalent Ge(1)Y4Co8 cuboctahedra, corners with twelve equivalent Co(2)Y4Co6Ge2 cuboctahedra, edges with four equivalent Ge(1)Y4Co8 cuboctahedra, edges with six equivalent Co(2)Y4Co6Ge2 cuboctahedra, faces with four equivalent Ge(1)Y4Co8 cuboctahedra, and faces with six equivalent Co(2)Y4Co6Ge2 cuboctahedra. Ge(1) is bonded to four equivalent Y(1), four equivalent Co(1), and four equivalent Co(2) atoms to form distorted GeY4Co8 cuboctahedra that share corners with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra, corners with eight equivalent Ge(1)Y4Co8 cuboctahedra, edges with two equivalent Ge(1)Y4Co8 cuboctahedra, edges with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra, faces with two equivalent Ge(1)Y4Co8 cuboctahedra, and faces with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra.
YCo4Ge crystallizes in the orthorhombic Cmmm space group. Y(1) is bonded in a 18-coordinate geometry to six equivalent Co(1), eight equivalent Co(2), and four equivalent Ge(1) atoms. There are two shorter (2.84 Å) and four longer (2.86 Å) Y(1)-Co(1) bond lengths. All Y(1)-Co(2) bond lengths are 3.17 Å. All Y(1)-Ge(1) bond lengths are 3.19 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), four equivalent Co(2), and two equivalent Ge(1) atoms. All Co(1)-Co(2) bond lengths are 2.46 Å. Both Co(1)-Ge(1) bond lengths are 2.46 Å. In the second Co site, Co(2) is bonded to four equivalent Y(1), two equivalent Co(2), four equivalent Co(1), and two equivalent Ge(1) atoms to form distorted CoY4Co6Ge2 cuboctahedra that share corners with four equivalent Ge(1)Y4Co8 cuboctahedra, corners with twelve equivalent Co(2)Y4Co6Ge2 cuboctahedra, edges with four equivalent Ge(1)Y4Co8 cuboctahedra, edges with six equivalent Co(2)Y4Co6Ge2 cuboctahedra, faces with four equivalent Ge(1)Y4Co8 cuboctahedra, and faces with six equivalent Co(2)Y4Co6Ge2 cuboctahedra. Both Co(2)-Co(2) bond lengths are 2.48 Å. Both Co(2)-Ge(1) bond lengths are 2.47 Å. Ge(1) is bonded to four equivalent Y(1), four equivalent Co(1), and four equivalent Co(2) atoms to form distorted GeY4Co8 cuboctahedra that share corners with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra, corners with eight equivalent Ge(1)Y4Co8 cuboctahedra, edges with two equivalent Ge(1)Y4Co8 cuboctahedra, edges with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra, faces with two equivalent Ge(1)Y4Co8 cuboctahedra, and faces with eight equivalent Co(2)Y4Co6Ge2 cuboctahedra.