Th(TcSi)2 crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded in a 16-coordinate geometry to eight equivalent Tc(1) and eight equivalent Si(1) atoms. Tc(1) is bonded in a 8-coordinate geometry to four equivalent Th(1) and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Th(1), four equivalent Tc(1), and one Si(1) atom.
Th(TcSi)2 crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded in a 16-coordinate geometry to eight equivalent Tc(1) and eight equivalent Si(1) atoms. All Th(1)-Tc(1) bond lengths are 3.24 Å. All Th(1)-Si(1) bond lengths are 3.29 Å. Tc(1) is bonded in a 8-coordinate geometry to four equivalent Th(1) and four equivalent Si(1) atoms. All Tc(1)-Si(1) bond lengths are 2.42 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Th(1), four equivalent Tc(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.59 Å.