Tb6Br7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted rectangular see-saw-like geometry to one Br(2), one Br(3), and two equivalent Br(1) atoms. In the second Tb site, Tb(2) is bonded in a 3-coordinate geometry to one Br(4) and two equivalent Br(2) atoms. In the third Tb site, Tb(3) is bonded to two equivalent Br(4) and three equivalent Br(3) atoms to form distorted edge-sharing TbBr5 square pyramids. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded in a square co-planar geometry to four equivalent Tb(1) atoms. In the second Br site, Br(2) is bonded in a 3-coordinate geometry to one Tb(1) and two equivalent Tb(2) atoms. In the third Br site, Br(3) is bonded in a distorted see-saw-like geometry to one Tb(1) and three equivalent Tb(3) atoms. In the fourth Br site, Br(4) is bonded in a 3-coordinate geometry to one Tb(2) and two equivalent Tb(3) atoms.
Tb6Br7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted rectangular see-saw-like geometry to one Br(2), one Br(3), and two equivalent Br(1) atoms. The Tb(1)-Br(2) bond length is 2.85 Å. The Tb(1)-Br(3) bond length is 2.99 Å. Both Tb(1)-Br(1) bond lengths are 3.04 Å. In the second Tb site, Tb(2) is bonded in a 3-coordinate geometry to one Br(4) and two equivalent Br(2) atoms. The Tb(2)-Br(4) bond length is 2.95 Å. Both Tb(2)-Br(2) bond lengths are 2.98 Å. In the third Tb site, Tb(3) is bonded to two equivalent Br(4) and three equivalent Br(3) atoms to form distorted edge-sharing TbBr5 square pyramids. Both Tb(3)-Br(4) bond lengths are 2.89 Å. There are two shorter (2.94 Å) and one longer (3.11 Å) Tb(3)-Br(3) bond length. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded in a square co-planar geometry to four equivalent Tb(1) atoms. In the second Br site, Br(2) is bonded in a 3-coordinate geometry to one Tb(1) and two equivalent Tb(2) atoms. In the third Br site, Br(3) is bonded in a distorted see-saw-like geometry to one Tb(1) and three equivalent Tb(3) atoms. In the fourth Br site, Br(4) is bonded in a 3-coordinate geometry to one Tb(2) and two equivalent Tb(3) atoms.