TbB2C2 crystallizes in the tetragonal P4_2/mmc space group. Tb(1) is bonded in a 16-coordinate geometry to eight equivalent B(1) and eight equivalent C(1) atoms. B(1) is bonded in a 2-coordinate geometry to four equivalent Tb(1) and two equivalent C(1) atoms. C(1) is bonded in a 3-coordinate geometry to four equivalent Tb(1), two equivalent B(1), and one C(1) atom.
TbB2C2 crystallizes in the tetragonal P4_2/mmc space group. Tb(1) is bonded in a 16-coordinate geometry to eight equivalent B(1) and eight equivalent C(1) atoms. All Tb(1)-B(1) bond lengths are 2.75 Å. All Tb(1)-C(1) bond lengths are 2.72 Å. B(1) is bonded in a 2-coordinate geometry to four equivalent Tb(1) and two equivalent C(1) atoms. Both B(1)-C(1) bond lengths are 1.61 Å. C(1) is bonded in a 3-coordinate geometry to four equivalent Tb(1), two equivalent B(1), and one C(1) atom. The C(1)-C(1) bond length is 1.43 Å.