TbCoGe2 crystallizes in the orthorhombic Cmcm space group. Tb(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), four equivalent Ge(2), and six equivalent Ge(1) atoms. Co(1) is bonded in a 5-coordinate geometry to four equivalent Tb(1), one Ge(1), and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Tb(1), one Co(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Co(1) atoms.
TbCoGe2 crystallizes in the orthorhombic Cmcm space group. Tb(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), four equivalent Ge(2), and six equivalent Ge(1) atoms. All Tb(1)-Co(1) bond lengths are 3.15 Å. There are two shorter (3.09 Å) and two longer (3.10 Å) Tb(1)-Ge(2) bond lengths. There are four shorter (3.11 Å) and two longer (3.28 Å) Tb(1)-Ge(1) bond lengths. Co(1) is bonded in a 5-coordinate geometry to four equivalent Tb(1), one Ge(1), and four equivalent Ge(2) atoms. The Co(1)-Ge(1) bond length is 2.24 Å. There are two shorter (2.35 Å) and two longer (2.36 Å) Co(1)-Ge(2) bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Tb(1), one Co(1), and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.54 Å. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Co(1) atoms.