Y7Cu3Te12 crystallizes in the triclinic P1 space group. There are seven inequivalent Y sites. In the first Y site, Y(1) is bonded in a hexagonal planar geometry to one Y(4), one Y(6), one Te(12), one Te(2), one Te(6), and one Te(8) atom. In the second Y site, Y(2) is bonded in a distorted rectangular see-saw-like geometry to one Te(2), one Te(6), one Te(7), and one Te(9) atom. In the third Y site, Y(3) is bonded to one Y(5), one Y(7), one Cu(3), one Te(1), one Te(3), one Te(7), and one Te(9) atom to form distorted YY2CuTe4 hexagonal pyramids that share  a cornercorner with one Te(3)Y2Cu3Te2 hexagonal pyramid and  an edgeedge with one Te(3)Y2Cu3Te2 hexagonal pyramid. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one Y(1), one Y(6), one Cu(1), one Te(10), one Te(2), one Te(4), and one Te(8) atom. In the fifth Y site, Y(5) is bonded in a 7-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(11), one Te(3), one Te(5), and one Te(9) atom. In the sixth Y site, Y(6) is bonded in a 7-coordinate geometry to one Y(1), one Y(4), one Cu(1), one Te(10), one Te(12), one Te(4), and one Te(6) atom. In the seventh Y site, Y(7) is bonded in a 8-coordinate geometry to one Y(3), one Y(5), one Cu(2), one Cu(3), one Te(1), one Te(11), one Te(5), and one Te(7) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one Y(4), one Y(6), one Te(12), one Te(3), and one Te(8) atom. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to one Y(5), one Y(7), one Cu(3), one Te(1), one Te(12), and one Te(3) atom. In the third Cu site, Cu(3) is bonded in a 6-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(3), one Te(5), and one Te(8) atom. There are twelve inequivalent Te sites. In the first Te site, Te(1) is bonded in a 5-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(3), and one Te(5) atom. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Y(1), one Y(2), one Y(4), one Te(4), and one Te(6) atom. In the third Te site, Te(3) is bonded to one Y(3), one Y(5), one Cu(1), one Cu(2), one Cu(3), one Te(1), and one Te(5) atom to form distorted TeY2Cu3Te2 hexagonal pyramids that share  a cornercorner with one Y(3)Y2CuTe4 hexagonal pyramid and  an edgeedge with one Y(3)Y2CuTe4 hexagonal pyramid. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Y(4), one Y(6), one Te(2), and one Te(6) atom. In the fifth Te site, Te(5) is bonded in a 5-coordinate geometry to one Y(5), one Y(7), one Cu(3), one Te(1), and one Te(3) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Y(1), one Y(2), one Y(6), one Te(2), and one Te(4) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Y(2), one Y(3), one Y(7), one Te(11), and one Te(9) atom. In the eighth Te site, Te(8) is bonded in a distorted hexagonal planar geometry to one Y(1), one Y(4), one Cu(1), one Cu(3), one Te(10), and one Te(12) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Y(2), one Y(3), one Y(5), one Te(11), and one Te(7) atom. In the tenth Te site, Te(10) is bonded in a 4-coordinate geometry to one Y(4), one Y(6), one Te(12), and one Te(8) atom. In the eleventh Te site, Te(11) is bonded in a 4-coordinate geometry to one Y(5), one Y(7), one Te(7), and one Te(9) atom. In the twelfth Te site, Te(12) is bonded in a distorted hexagonal planar geometry to one Y(1), one Y(6), one Cu(1), one Cu(2), one Te(10), and one Te(8) atom.
Y7Cu3Te12 crystallizes in the triclinic P1 space group. There are seven inequivalent Y sites. In the first Y site, Y(1) is bonded in a hexagonal planar geometry to one Y(4), one Y(6), one Te(12), one Te(2), one Te(6), and one Te(8) atom. The Y(1)-Y(4) bond length is 2.54 Å. The Y(1)-Y(6) bond length is 2.54 Å. The Y(1)-Te(12) bond length is 3.11 Å. The Y(1)-Te(2) bond length is 3.06 Å. The Y(1)-Te(6) bond length is 3.07 Å. The Y(1)-Te(8) bond length is 3.11 Å. In the second Y site, Y(2) is bonded in a distorted rectangular see-saw-like geometry to one Te(2), one Te(6), one Te(7), and one Te(9) atom. The Y(2)-Te(2) bond length is 3.06 Å. The Y(2)-Te(6) bond length is 3.06 Å. The Y(2)-Te(7) bond length is 3.10 Å. The Y(2)-Te(9) bond length is 3.10 Å. In the third Y site, Y(3) is bonded to one Y(5), one Y(7), one Cu(3), one Te(1), one Te(3), one Te(7), and one Te(9) atom to form distorted YY2CuTe4 hexagonal pyramids that share  a cornercorner with one Te(3)Y2Cu3Te2 hexagonal pyramid and  an edgeedge with one Te(3)Y2Cu3Te2 hexagonal pyramid. The Y(3)-Y(5) bond length is 2.55 Å. The Y(3)-Y(7) bond length is 2.50 Å. The Y(3)-Cu(3) bond length is 3.52 Å. The Y(3)-Te(1) bond length is 3.15 Å. The Y(3)-Te(3) bond length is 3.08 Å. The Y(3)-Te(7) bond length is 3.06 Å. The Y(3)-Te(9) bond length is 3.06 Å. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one Y(1), one Y(6), one Cu(1), one Te(10), one Te(2), one Te(4), and one Te(8) atom. The Y(4)-Y(6) bond length is 2.47 Å. The Y(4)-Cu(1) bond length is 3.50 Å. The Y(4)-Te(10) bond length is 3.07 Å. The Y(4)-Te(2) bond length is 3.13 Å. The Y(4)-Te(4) bond length is 3.11 Å. The Y(4)-Te(8) bond length is 3.05 Å. In the fifth Y site, Y(5) is bonded in a 7-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(11), one Te(3), one Te(5), and one Te(9) atom. The Y(5)-Y(7) bond length is 2.49 Å. The Y(5)-Cu(2) bond length is 3.53 Å. The Y(5)-Te(11) bond length is 3.07 Å. The Y(5)-Te(3) bond length is 3.08 Å. The Y(5)-Te(5) bond length is 3.13 Å. The Y(5)-Te(9) bond length is 3.07 Å. In the sixth Y site, Y(6) is bonded in a 7-coordinate geometry to one Y(1), one Y(4), one Cu(1), one Te(10), one Te(12), one Te(4), and one Te(6) atom. The Y(6)-Cu(1) bond length is 3.50 Å. The Y(6)-Te(10) bond length is 3.07 Å. The Y(6)-Te(12) bond length is 3.06 Å. The Y(6)-Te(4) bond length is 3.12 Å. The Y(6)-Te(6) bond length is 3.13 Å. In the seventh Y site, Y(7) is bonded in a 8-coordinate geometry to one Y(3), one Y(5), one Cu(2), one Cu(3), one Te(1), one Te(11), one Te(5), and one Te(7) atom. The Y(7)-Cu(2) bond length is 3.56 Å. The Y(7)-Cu(3) bond length is 3.56 Å. The Y(7)-Te(1) bond length is 3.10 Å. The Y(7)-Te(11) bond length is 3.10 Å. The Y(7)-Te(5) bond length is 3.11 Å. The Y(7)-Te(7) bond length is 3.11 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one Y(4), one Y(6), one Te(12), one Te(3), and one Te(8) atom. The Cu(1)-Te(12) bond length is 2.65 Å. The Cu(1)-Te(3) bond length is 2.70 Å. The Cu(1)-Te(8) bond length is 2.65 Å. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to one Y(5), one Y(7), one Cu(3), one Te(1), one Te(12), and one Te(3) atom. The Cu(2)-Cu(3) bond length is 2.53 Å. The Cu(2)-Te(1) bond length is 2.60 Å. The Cu(2)-Te(12) bond length is 2.66 Å. The Cu(2)-Te(3) bond length is 2.68 Å. In the third Cu site, Cu(3) is bonded in a 6-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(3), one Te(5), and one Te(8) atom. The Cu(3)-Te(3) bond length is 2.67 Å. The Cu(3)-Te(5) bond length is 2.61 Å. The Cu(3)-Te(8) bond length is 2.66 Å. There are twelve inequivalent Te sites. In the first Te site, Te(1) is bonded in a 5-coordinate geometry to one Y(3), one Y(7), one Cu(2), one Te(3), and one Te(5) atom. The Te(1)-Te(3) bond length is 2.53 Å. The Te(1)-Te(5) bond length is 2.50 Å. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Y(1), one Y(2), one Y(4), one Te(4), and one Te(6) atom. The Te(2)-Te(4) bond length is 2.52 Å. The Te(2)-Te(6) bond length is 2.51 Å. In the third Te site, Te(3) is bonded to one Y(3), one Y(5), one Cu(1), one Cu(2), one Cu(3), one Te(1), and one Te(5) atom to form distorted TeY2Cu3Te2 hexagonal pyramids that share  a cornercorner with one Y(3)Y2CuTe4 hexagonal pyramid and  an edgeedge with one Y(3)Y2CuTe4 hexagonal pyramid. The Te(3)-Te(5) bond length is 2.53 Å. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Y(4), one Y(6), one Te(2), and one Te(6) atom. The Te(4)-Te(6) bond length is 2.52 Å. In the fifth Te site, Te(5) is bonded in a 5-coordinate geometry to one Y(5), one Y(7), one Cu(3), one Te(1), and one Te(3) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Y(1), one Y(2), one Y(6), one Te(2), and one Te(4) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Y(2), one Y(3), one Y(7), one Te(11), and one Te(9) atom. The Te(7)-Te(11) bond length is 2.51 Å. The Te(7)-Te(9) bond length is 2.52 Å. In the eighth Te site, Te(8) is bonded in a distorted hexagonal planar geometry to one Y(1), one Y(4), one Cu(1), one Cu(3), one Te(10), and one Te(12) atom. The Te(8)-Te(10) bond length is 2.51 Å. The Te(8)-Te(12) bond length is 2.54 Å. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Y(2), one Y(3), one Y(5), one Te(11), and one Te(7) atom. The Te(9)-Te(11) bond length is 2.52 Å. In the tenth Te site, Te(10) is bonded in a 4-coordinate geometry to one Y(4), one Y(6), one Te(12), and one Te(8) atom. The Te(10)-Te(12) bond length is 2.50 Å. In the eleventh Te site, Te(11) is bonded in a 4-coordinate geometry to one Y(5), one Y(7), one Te(7), and one Te(9) atom. In the twelfth Te site, Te(12) is bonded in a distorted hexagonal planar geometry to one Y(1), one Y(6), one Cu(1), one Cu(2), one Te(10), and one Te(8) atom.