Th2Ge3 crystallizes in the hexagonal P-6m2 space group. Th(1) is bonded in a 9-coordinate geometry to three equivalent Ge(1), three equivalent Ge(2), and three equivalent Ge(3) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded to six equivalent Th(1) atoms to form distorted edge-sharing GeTh6 pentagonal pyramids. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Ge(1) atoms.
Th2Ge3 crystallizes in the hexagonal P-6m2 space group. Th(1) is bonded in a 9-coordinate geometry to three equivalent Ge(1), three equivalent Ge(2), and three equivalent Ge(3) atoms. All Th(1)-Ge(1) bond lengths are 3.24 Å. All Th(1)-Ge(2) bond lengths are 3.10 Å. All Th(1)-Ge(3) bond lengths are 3.24 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Ge(3) atoms. All Ge(1)-Ge(3) bond lengths are 2.47 Å. In the second Ge site, Ge(2) is bonded to six equivalent Th(1) atoms to form distorted edge-sharing GeTh6 pentagonal pyramids. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Ge(1) atoms.