Sm3(Sb7Te12)2 crystallizes in the triclinic P1 space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 7-coordinate geometry to one Te(1), one Te(18), one Te(19), one Te(2), one Te(20), one Te(24), one Te(7), and one Te(8) atom. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(10), one Te(17), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(8) atom. In the third Sm site, Sm(3) is bonded in a 8-coordinate geometry to one Te(13), one Te(18), one Te(19), one Te(20), one Te(22), one Te(24), one Te(7), and one Te(9) atom. There are fourteen inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 4-coordinate geometry to one Te(15), one Te(16), one Te(17), one Te(3), and one Te(5) atom. In the second Sb site, Sb(2) is bonded in a 5-coordinate geometry to one Te(1), one Te(10), one Te(2), one Te(20), one Te(4), and one Te(8) atom. In the third Sb site, Sb(3) is bonded in a distorted octahedral geometry to one Te(12), one Te(13), one Te(21), one Te(22), one Te(23), and one Te(9) atom. In the fourth Sb site, Sb(4) is bonded to one Te(10), one Te(15), one Te(2), one Te(4), one Te(6), and one Te(8) atom to form distorted corner-sharing SbTe6 octahedra. In the fifth Sb site, Sb(5) is bonded to one Te(1), one Te(15), one Te(16), one Te(17), one Te(4), and one Te(6) atom to form distorted SbTe6 pentagonal pyramids that share corners with three equivalent Sb(4)Te6 octahedra,  a cornercorner with one Sb(7)Te6 pentagonal pyramid, and  a cornercorner with one Sb(12)Te4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-80°. In the sixth Sb site, Sb(6) is bonded in a 5-coordinate geometry to one Te(11), one Te(15), one Te(16), one Te(3), and one Te(6) atom. In the seventh Sb site, Sb(7) is bonded to one Te(1), one Te(10), one Te(19), one Te(24), one Te(7), and one Te(8) atom to form distorted corner-sharing SbTe6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 53-57°. In the eighth Sb site, Sb(8) is bonded in a 3-coordinate geometry to one Te(13), one Te(24), and one Te(9) atom. In the ninth Sb site, Sb(9) is bonded in a distorted rectangular see-saw-like geometry to one Te(11), one Te(12), one Te(21), and one Te(5) atom. In the tenth Sb site, Sb(10) is bonded in a 4-coordinate geometry to one Te(12), one Te(14), one Te(21), and one Te(3) atom. In the eleventh Sb site, Sb(11) is bonded in a 3-coordinate geometry to one Te(14), one Te(22), and one Te(23) atom. In the twelfth Sb site, Sb(12) is bonded to one Te(11), one Te(17), one Te(3), and one Te(5) atom to form distorted corner-sharing SbTe4 trigonal pyramids. In the thirteenth Sb site, Sb(13) is bonded in a 3-coordinate geometry to one Te(18), one Te(20), one Te(7), and one Te(9) atom. In the fourteenth Sb site, Sb(14) is bonded in a 3-coordinate geometry to one Te(12), one Te(14), one Te(23), and one Te(9) atom. There are twenty-four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), one Sb(5), and one Sb(7) atom. In the second Te site, Te(2) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), and one Sb(4) atom. In the third Te site, Te(3) is bonded to one Sb(1), one Sb(10), one Sb(12), and one Sb(6) atom to form corner-sharing TeSb4 trigonal pyramids. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one Sm(2), one Sb(2), one Sb(4), and one Sb(5) atom. In the fifth Te site, Te(5) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(12), and one Sb(9) atom. In the sixth Te site, Te(6) is bonded in a distorted see-saw-like geometry to one Sm(2), one Sb(4), one Sb(5), and one Sb(6) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sm(3), one Sb(13), and one Sb(7) atom. In the eighth Te site, Te(8) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), one Sb(4), and one Sb(7) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Sm(3), one Sb(13), one Sb(14), one Sb(3), and one Sb(8) atom. In the tenth Te site, Te(10) is bonded in a 4-coordinate geometry to one Sm(2), one Sb(2), one Sb(4), and one Sb(7) atom. In the eleventh Te site, Te(11) is bonded in a 3-coordinate geometry to one Sb(12), one Sb(6), and one Sb(9) atom. In the twelfth Te site, Te(12) is bonded to one Sb(10), one Sb(14), one Sb(3), and one Sb(9) atom to form corner-sharing TeSb4 trigonal pyramids. In the thirteenth Te site, Te(13) is bonded in a 3-coordinate geometry to one Sm(3), one Sb(3), and one Sb(8) atom. In the fourteenth Te site, Te(14) is bonded in a distorted T-shaped geometry to one Sb(10), one Sb(11), and one Sb(14) atom. In the fifteenth Te site, Te(15) is bonded in a distorted rectangular see-saw-like geometry to one Sb(1), one Sb(4), one Sb(5), and one Sb(6) atom. In the sixteenth Te site, Te(16) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(5), and one Sb(6) atom. In the seventeenth Te site, Te(17) is bonded in a 4-coordinate geometry to one Sm(2), one Sb(1), one Sb(12), and one Sb(5) atom. In the eighteenth Te site, Te(18) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(3), and one Sb(13) atom. In the nineteenth Te site, Te(19) is bonded in a distorted T-shaped geometry to one Sm(1), one Sm(3), and one Sb(7) atom. In the twentieth Te site, Te(20) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sb(13), and one Sb(2) atom. In the twenty-first Te site, Te(21) is bonded in a 3-coordinate geometry to one Sb(10), one Sb(3), and one Sb(9) atom. In the twenty-second Te site, Te(22) is bonded in a 3-coordinate geometry to one Sm(3), one Sb(11), and one Sb(3) atom. In the twenty-third Te site, Te(23) is bonded in a 3-coordinate geometry to one Sb(11), one Sb(14), and one Sb(3) atom. In the twenty-fourth Te site, Te(24) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sb(7), and one Sb(8) atom.
Sm3(Sb7Te12)2 crystallizes in the triclinic P1 space group. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 7-coordinate geometry to one Te(1), one Te(18), one Te(19), one Te(2), one Te(20), one Te(24), one Te(7), and one Te(8) atom. The Sm(1)-Te(1) bond length is 3.97 Å. The Sm(1)-Te(18) bond length is 3.30 Å. The Sm(1)-Te(19) bond length is 3.12 Å. The Sm(1)-Te(2) bond length is 3.14 Å. The Sm(1)-Te(20) bond length is 3.30 Å. The Sm(1)-Te(24) bond length is 3.18 Å. The Sm(1)-Te(7) bond length is 3.17 Å. The Sm(1)-Te(8) bond length is 3.36 Å. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one Te(1), one Te(10), one Te(17), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(8) atom. The Sm(2)-Te(1) bond length is 3.48 Å. The Sm(2)-Te(10) bond length is 3.10 Å. The Sm(2)-Te(17) bond length is 3.18 Å. The Sm(2)-Te(2) bond length is 3.10 Å. The Sm(2)-Te(4) bond length is 3.37 Å. The Sm(2)-Te(6) bond length is 3.49 Å. The Sm(2)-Te(7) bond length is 3.40 Å. The Sm(2)-Te(8) bond length is 3.23 Å. In the third Sm site, Sm(3) is bonded in a 8-coordinate geometry to one Te(13), one Te(18), one Te(19), one Te(20), one Te(22), one Te(24), one Te(7), and one Te(9) atom. The Sm(3)-Te(13) bond length is 3.19 Å. The Sm(3)-Te(18) bond length is 3.31 Å. The Sm(3)-Te(19) bond length is 3.27 Å. The Sm(3)-Te(20) bond length is 3.18 Å. The Sm(3)-Te(22) bond length is 3.19 Å. The Sm(3)-Te(24) bond length is 3.39 Å. The Sm(3)-Te(7) bond length is 3.24 Å. The Sm(3)-Te(9) bond length is 3.50 Å. There are fourteen inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 4-coordinate geometry to one Te(15), one Te(16), one Te(17), one Te(3), and one Te(5) atom. The Sb(1)-Te(15) bond length is 3.46 Å. The Sb(1)-Te(16) bond length is 2.96 Å. The Sb(1)-Te(17) bond length is 3.06 Å. The Sb(1)-Te(3) bond length is 3.14 Å. The Sb(1)-Te(5) bond length is 2.96 Å. In the second Sb site, Sb(2) is bonded in a 5-coordinate geometry to one Te(1), one Te(10), one Te(2), one Te(20), one Te(4), and one Te(8) atom. The Sb(2)-Te(1) bond length is 2.87 Å. The Sb(2)-Te(10) bond length is 3.17 Å. The Sb(2)-Te(2) bond length is 3.04 Å. The Sb(2)-Te(20) bond length is 3.36 Å. The Sb(2)-Te(4) bond length is 2.98 Å. The Sb(2)-Te(8) bond length is 3.50 Å. In the third Sb site, Sb(3) is bonded in a distorted octahedral geometry to one Te(12), one Te(13), one Te(21), one Te(22), one Te(23), and one Te(9) atom. The Sb(3)-Te(12) bond length is 3.25 Å. The Sb(3)-Te(13) bond length is 3.03 Å. The Sb(3)-Te(21) bond length is 3.35 Å. The Sb(3)-Te(22) bond length is 2.96 Å. The Sb(3)-Te(23) bond length is 3.39 Å. The Sb(3)-Te(9) bond length is 2.97 Å. In the fourth Sb site, Sb(4) is bonded to one Te(10), one Te(15), one Te(2), one Te(4), one Te(6), and one Te(8) atom to form distorted corner-sharing SbTe6 octahedra. The Sb(4)-Te(10) bond length is 3.12 Å. The Sb(4)-Te(15) bond length is 2.88 Å. The Sb(4)-Te(2) bond length is 3.27 Å. The Sb(4)-Te(4) bond length is 2.99 Å. The Sb(4)-Te(6) bond length is 3.08 Å. The Sb(4)-Te(8) bond length is 3.36 Å. In the fifth Sb site, Sb(5) is bonded to one Te(1), one Te(15), one Te(16), one Te(17), one Te(4), and one Te(6) atom to form distorted SbTe6 pentagonal pyramids that share corners with three equivalent Sb(4)Te6 octahedra,  a cornercorner with one Sb(7)Te6 pentagonal pyramid, and  a cornercorner with one Sb(12)Te4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-80°. The Sb(5)-Te(1) bond length is 3.40 Å. The Sb(5)-Te(15) bond length is 3.13 Å. The Sb(5)-Te(16) bond length is 2.96 Å. The Sb(5)-Te(17) bond length is 3.11 Å. The Sb(5)-Te(4) bond length is 3.43 Å. The Sb(5)-Te(6) bond length is 2.93 Å. In the sixth Sb site, Sb(6) is bonded in a 5-coordinate geometry to one Te(11), one Te(15), one Te(16), one Te(3), and one Te(6) atom. The Sb(6)-Te(11) bond length is 3.05 Å. The Sb(6)-Te(15) bond length is 3.29 Å. The Sb(6)-Te(16) bond length is 3.35 Å. The Sb(6)-Te(3) bond length is 2.95 Å. The Sb(6)-Te(6) bond length is 3.15 Å. In the seventh Sb site, Sb(7) is bonded to one Te(1), one Te(10), one Te(19), one Te(24), one Te(7), and one Te(8) atom to form distorted corner-sharing SbTe6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 53-57°. The Sb(7)-Te(1) bond length is 3.07 Å. The Sb(7)-Te(10) bond length is 3.16 Å. The Sb(7)-Te(19) bond length is 2.98 Å. The Sb(7)-Te(24) bond length is 3.38 Å. The Sb(7)-Te(7) bond length is 3.23 Å. The Sb(7)-Te(8) bond length is 2.96 Å. In the eighth Sb site, Sb(8) is bonded in a 3-coordinate geometry to one Te(13), one Te(24), and one Te(9) atom. The Sb(8)-Te(13) bond length is 2.92 Å. The Sb(8)-Te(24) bond length is 2.82 Å. The Sb(8)-Te(9) bond length is 2.96 Å. In the ninth Sb site, Sb(9) is bonded in a distorted rectangular see-saw-like geometry to one Te(11), one Te(12), one Te(21), and one Te(5) atom. The Sb(9)-Te(11) bond length is 2.94 Å. The Sb(9)-Te(12) bond length is 3.17 Å. The Sb(9)-Te(21) bond length is 2.85 Å. The Sb(9)-Te(5) bond length is 3.28 Å. In the tenth Sb site, Sb(10) is bonded in a 4-coordinate geometry to one Te(12), one Te(14), one Te(21), and one Te(3) atom. The Sb(10)-Te(12) bond length is 3.03 Å. The Sb(10)-Te(14) bond length is 3.28 Å. The Sb(10)-Te(21) bond length is 2.97 Å. The Sb(10)-Te(3) bond length is 3.08 Å. In the eleventh Sb site, Sb(11) is bonded in a 3-coordinate geometry to one Te(14), one Te(22), and one Te(23) atom. The Sb(11)-Te(14) bond length is 2.88 Å. The Sb(11)-Te(22) bond length is 2.92 Å. The Sb(11)-Te(23) bond length is 2.86 Å. In the twelfth Sb site, Sb(12) is bonded to one Te(11), one Te(17), one Te(3), and one Te(5) atom to form distorted corner-sharing SbTe4 trigonal pyramids. The Sb(12)-Te(11) bond length is 2.94 Å. The Sb(12)-Te(17) bond length is 3.10 Å. The Sb(12)-Te(3) bond length is 3.01 Å. The Sb(12)-Te(5) bond length is 2.92 Å. In the thirteenth Sb site, Sb(13) is bonded in a 3-coordinate geometry to one Te(18), one Te(20), one Te(7), and one Te(9) atom. The Sb(13)-Te(18) bond length is 2.90 Å. The Sb(13)-Te(20) bond length is 2.84 Å. The Sb(13)-Te(7) bond length is 2.95 Å. The Sb(13)-Te(9) bond length is 3.46 Å. In the fourteenth Sb site, Sb(14) is bonded in a 3-coordinate geometry to one Te(12), one Te(14), one Te(23), and one Te(9) atom. The Sb(14)-Te(12) bond length is 2.88 Å. The Sb(14)-Te(14) bond length is 2.97 Å. The Sb(14)-Te(23) bond length is 2.97 Å. The Sb(14)-Te(9) bond length is 3.51 Å. There are twenty-four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), one Sb(5), and one Sb(7) atom. In the second Te site, Te(2) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), and one Sb(4) atom. In the third Te site, Te(3) is bonded to one Sb(1), one Sb(10), one Sb(12), and one Sb(6) atom to form corner-sharing TeSb4 trigonal pyramids. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one Sm(2), one Sb(2), one Sb(4), and one Sb(5) atom. In the fifth Te site, Te(5) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(12), and one Sb(9) atom. In the sixth Te site, Te(6) is bonded in a distorted see-saw-like geometry to one Sm(2), one Sb(4), one Sb(5), and one Sb(6) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sm(3), one Sb(13), and one Sb(7) atom. In the eighth Te site, Te(8) is bonded in a 5-coordinate geometry to one Sm(1), one Sm(2), one Sb(2), one Sb(4), and one Sb(7) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Sm(3), one Sb(13), one Sb(14), one Sb(3), and one Sb(8) atom. In the tenth Te site, Te(10) is bonded in a 4-coordinate geometry to one Sm(2), one Sb(2), one Sb(4), and one Sb(7) atom. In the eleventh Te site, Te(11) is bonded in a 3-coordinate geometry to one Sb(12), one Sb(6), and one Sb(9) atom. In the twelfth Te site, Te(12) is bonded to one Sb(10), one Sb(14), one Sb(3), and one Sb(9) atom to form corner-sharing TeSb4 trigonal pyramids. In the thirteenth Te site, Te(13) is bonded in a 3-coordinate geometry to one Sm(3), one Sb(3), and one Sb(8) atom. In the fourteenth Te site, Te(14) is bonded in a distorted T-shaped geometry to one Sb(10), one Sb(11), and one Sb(14) atom. In the fifteenth Te site, Te(15) is bonded in a distorted rectangular see-saw-like geometry to one Sb(1), one Sb(4), one Sb(5), and one Sb(6) atom. In the sixteenth Te site, Te(16) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(5), and one Sb(6) atom. In the seventeenth Te site, Te(17) is bonded in a 4-coordinate geometry to one Sm(2), one Sb(1), one Sb(12), and one Sb(5) atom. In the eighteenth Te site, Te(18) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(3), and one Sb(13) atom. In the nineteenth Te site, Te(19) is bonded in a distorted T-shaped geometry to one Sm(1), one Sm(3), and one Sb(7) atom. In the twentieth Te site, Te(20) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sb(13), and one Sb(2) atom. In the twenty-first Te site, Te(21) is bonded in a 3-coordinate geometry to one Sb(10), one Sb(3), and one Sb(9) atom. In the twenty-second Te site, Te(22) is bonded in a 3-coordinate geometry to one Sm(3), one Sb(11), and one Sb(3) atom. In the twenty-third Te site, Te(23) is bonded in a 3-coordinate geometry to one Sb(11), one Sb(14), and one Sb(3) atom. In the twenty-fourth Te site, Te(24) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sb(7), and one Sb(8) atom.