Tb7Co6Sn23 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 12-coordinate geometry to two equivalent Sn(4), two equivalent Sn(8), four equivalent Sn(5), and four equivalent Sn(7) atoms. In the second Tb site, Tb(2) is bonded in a 12-coordinate geometry to two equivalent Co(2), one Sn(1), one Sn(9), two equivalent Sn(5), two equivalent Sn(8), and four equivalent Sn(3) atoms. In the third Tb site, Tb(3) is bonded in a 12-coordinate geometry to one Co(1), one Co(2), one Sn(1), one Sn(4), one Sn(5), one Sn(9), two equivalent Sn(2), two equivalent Sn(3), and two equivalent Sn(7) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Tb(3), one Sn(4), one Sn(9), and two equivalent Sn(7) atoms to form distorted CoTb2Sn4 octahedra that share  a cornercorner with one Sn(6)Sn6 octahedra, corners with two equivalent Co(2)Tb2Sn4 octahedra, and edges with two equivalent Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 7-23°. In the second Co site, Co(2) is bonded to one Tb(2), one Tb(3), one Sn(5), one Sn(7), one Sn(8), and one Sn(9) atom to form distorted CoTb2Sn4 octahedra that share  a cornercorner with one Co(1)Tb2Sn4 octahedra,  a cornercorner with one Co(2)Tb2Sn4 octahedra,  a cornercorner with one Sn(6)Sn6 octahedra,  an edgeedge with one Co(1)Tb2Sn4 octahedra, and  an edgeedge with one Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 9-25°. There are nine inequivalent Sn sites. In the first Sn site, Sn(4) is bonded in a distorted single-bond geometry to one Tb(1), two equivalent Tb(3), one Co(1), one Sn(2), and one Sn(6) atom. In the second Sn site, Sn(5) is bonded in a distorted single-bond geometry to one Tb(1), one Tb(2), one Tb(3), one Co(2), one Sn(3), and one Sn(6) atom. In the third Sn site, Sn(6) is bonded to two equivalent Sn(4) and four equivalent Sn(5) atoms to form SnSn6 octahedra that share corners with two equivalent Co(1)Tb2Sn4 octahedra and corners with four equivalent Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 7-9°. In the fourth Sn site, Sn(7) is bonded in a 2-coordinate geometry to one Tb(1), two equivalent Tb(3), one Co(1), and one Co(2) atom. In the fifth Sn site, Sn(8) is bonded in a 2-coordinate geometry to one Tb(1), two equivalent Tb(2), and two equivalent Co(2) atoms. In the sixth Sn site, Sn(9) is bonded in a distorted trigonal non-coplanar geometry to one Tb(2), two equivalent Tb(3), one Co(1), two equivalent Co(2), and one Sn(1) atom. In the seventh Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Tb(2), two equivalent Tb(3), one Sn(2), one Sn(9), and two equivalent Sn(3) atoms. In the eighth Sn site, Sn(2) is bonded in a 8-coordinate geometry to four equivalent Tb(3), one Sn(1), one Sn(4), and two equivalent Sn(3) atoms. In the ninth Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), one Sn(1), one Sn(2), one Sn(3), and one Sn(5) atom.
Tb7Co6Sn23 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 12-coordinate geometry to two equivalent Sn(4), two equivalent Sn(8), four equivalent Sn(5), and four equivalent Sn(7) atoms. Both Tb(1)-Sn(4) bond lengths are 3.95 Å. Both Tb(1)-Sn(8) bond lengths are 3.62 Å. All Tb(1)-Sn(5) bond lengths are 3.96 Å. All Tb(1)-Sn(7) bond lengths are 3.61 Å. In the second Tb site, Tb(2) is bonded in a 12-coordinate geometry to two equivalent Co(2), one Sn(1), one Sn(9), two equivalent Sn(5), two equivalent Sn(8), and four equivalent Sn(3) atoms. Both Tb(2)-Co(2) bond lengths are 2.95 Å. The Tb(2)-Sn(1) bond length is 3.65 Å. The Tb(2)-Sn(9) bond length is 3.40 Å. Both Tb(2)-Sn(5) bond lengths are 3.41 Å. Both Tb(2)-Sn(8) bond lengths are 3.57 Å. There are two shorter (3.39 Å) and two longer (3.41 Å) Tb(2)-Sn(3) bond lengths. In the third Tb site, Tb(3) is bonded in a 12-coordinate geometry to one Co(1), one Co(2), one Sn(1), one Sn(4), one Sn(5), one Sn(9), two equivalent Sn(2), two equivalent Sn(3), and two equivalent Sn(7) atoms. The Tb(3)-Co(1) bond length is 2.92 Å. The Tb(3)-Co(2) bond length is 2.92 Å. The Tb(3)-Sn(1) bond length is 3.62 Å. The Tb(3)-Sn(4) bond length is 3.44 Å. The Tb(3)-Sn(5) bond length is 3.42 Å. The Tb(3)-Sn(9) bond length is 3.45 Å. There is one shorter (3.39 Å) and one longer (3.40 Å) Tb(3)-Sn(2) bond length. There is one shorter (3.39 Å) and one longer (3.41 Å) Tb(3)-Sn(3) bond length. There is one shorter (3.58 Å) and one longer (3.59 Å) Tb(3)-Sn(7) bond length. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Tb(3), one Sn(4), one Sn(9), and two equivalent Sn(7) atoms to form distorted CoTb2Sn4 octahedra that share  a cornercorner with one Sn(6)Sn6 octahedra, corners with two equivalent Co(2)Tb2Sn4 octahedra, and edges with two equivalent Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 7-23°. The Co(1)-Sn(4) bond length is 2.35 Å. The Co(1)-Sn(9) bond length is 2.50 Å. Both Co(1)-Sn(7) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded to one Tb(2), one Tb(3), one Sn(5), one Sn(7), one Sn(8), and one Sn(9) atom to form distorted CoTb2Sn4 octahedra that share  a cornercorner with one Co(1)Tb2Sn4 octahedra,  a cornercorner with one Co(2)Tb2Sn4 octahedra,  a cornercorner with one Sn(6)Sn6 octahedra,  an edgeedge with one Co(1)Tb2Sn4 octahedra, and  an edgeedge with one Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 9-25°. The Co(2)-Sn(5) bond length is 2.34 Å. The Co(2)-Sn(7) bond length is 2.43 Å. The Co(2)-Sn(8) bond length is 2.44 Å. The Co(2)-Sn(9) bond length is 2.50 Å. There are nine inequivalent Sn sites. In the first Sn site, Sn(4) is bonded in a distorted single-bond geometry to one Tb(1), two equivalent Tb(3), one Co(1), one Sn(2), and one Sn(6) atom. The Sn(4)-Sn(2) bond length is 3.13 Å. The Sn(4)-Sn(6) bond length is 2.81 Å. In the second Sn site, Sn(5) is bonded in a distorted single-bond geometry to one Tb(1), one Tb(2), one Tb(3), one Co(2), one Sn(3), and one Sn(6) atom. The Sn(5)-Sn(3) bond length is 3.14 Å. The Sn(5)-Sn(6) bond length is 2.81 Å. In the third Sn site, Sn(6) is bonded to two equivalent Sn(4) and four equivalent Sn(5) atoms to form SnSn6 octahedra that share corners with two equivalent Co(1)Tb2Sn4 octahedra and corners with four equivalent Co(2)Tb2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 7-9°. In the fourth Sn site, Sn(7) is bonded in a 2-coordinate geometry to one Tb(1), two equivalent Tb(3), one Co(1), and one Co(2) atom. In the fifth Sn site, Sn(8) is bonded in a 2-coordinate geometry to one Tb(1), two equivalent Tb(2), and two equivalent Co(2) atoms. In the sixth Sn site, Sn(9) is bonded in a distorted trigonal non-coplanar geometry to one Tb(2), two equivalent Tb(3), one Co(1), two equivalent Co(2), and one Sn(1) atom. The Sn(9)-Sn(1) bond length is 2.99 Å. In the seventh Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Tb(2), two equivalent Tb(3), one Sn(2), one Sn(9), and two equivalent Sn(3) atoms. The Sn(1)-Sn(2) bond length is 3.16 Å. Both Sn(1)-Sn(3) bond lengths are 3.16 Å. In the eighth Sn site, Sn(2) is bonded in a 8-coordinate geometry to four equivalent Tb(3), one Sn(1), one Sn(4), and two equivalent Sn(3) atoms. Both Sn(2)-Sn(3) bond lengths are 3.21 Å. In the ninth Sn site, Sn(3) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), one Sn(1), one Sn(2), one Sn(3), and one Sn(5) atom. The Sn(3)-Sn(3) bond length is 3.22 Å.