Ta2Co3Ge crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), nine equivalent Co(1), and three equivalent Ge(1) atoms. Co(1) is bonded to six equivalent Ta(1), four equivalent Co(1), and two equivalent Ge(1) atoms to form distorted CoTa6Co4Ge2 cuboctahedra that share corners with four equivalent Ge(1)Ta6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Ta6Co4Ge2 cuboctahedra, edges with six equivalent Co(1)Ta6Co4Ge2 cuboctahedra, faces with six equivalent Ge(1)Ta6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Ta6Co4Ge2 cuboctahedra. Ge(1) is bonded to six equivalent Ta(1) and six equivalent Co(1) atoms to form GeTa6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Ta6Co4Ge2 cuboctahedra, edges with six equivalent Ge(1)Ta6Co6 cuboctahedra, faces with two equivalent Ge(1)Ta6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Ta6Co4Ge2 cuboctahedra.
Ta2Co3Ge crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), nine equivalent Co(1), and three equivalent Ge(1) atoms. There is one shorter (2.87 Å) and three longer (2.95 Å) Ta(1)-Ta(1) bond lengths. There are three shorter (2.72 Å) and six longer (2.82 Å) Ta(1)-Co(1) bond lengths. All Ta(1)-Ge(1) bond lengths are 2.84 Å. Co(1) is bonded to six equivalent Ta(1), four equivalent Co(1), and two equivalent Ge(1) atoms to form distorted CoTa6Co4Ge2 cuboctahedra that share corners with four equivalent Ge(1)Ta6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Ta6Co4Ge2 cuboctahedra, edges with six equivalent Co(1)Ta6Co4Ge2 cuboctahedra, faces with six equivalent Ge(1)Ta6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Ta6Co4Ge2 cuboctahedra. There are two shorter (2.36 Å) and two longer (2.49 Å) Co(1)-Co(1) bond lengths. Both Co(1)-Ge(1) bond lengths are 2.38 Å. Ge(1) is bonded to six equivalent Ta(1) and six equivalent Co(1) atoms to form GeTa6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Ta6Co4Ge2 cuboctahedra, edges with six equivalent Ge(1)Ta6Co6 cuboctahedra, faces with two equivalent Ge(1)Ta6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Ta6Co4Ge2 cuboctahedra.