Tb8Cu3Te16 crystallizes in the triclinic P1 space group. There are eight inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(10), one Te(12), one Te(14), one Te(15), one Te(2), one Te(5), and one Te(8) atom. In the second Tb site, Tb(2) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(13), one Te(15), one Te(2), one Te(3), one Te(4), one Te(7), and one Te(8) atom. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Cu(2), one Te(10), one Te(13), one Te(16), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(9) atom. In the fourth Tb site, Tb(4) is bonded in a 9-coordinate geometry to one Cu(2), one Te(1), one Te(11), one Te(12), one Te(3), one Te(5), one Te(6), one Te(7), and one Te(8) atom. In the fifth Tb site, Tb(5) is bonded in a 10-coordinate geometry to one Cu(2), one Cu(3), one Te(10), one Te(11), one Te(12), one Te(15), one Te(16), one Te(5), one Te(7), and one Te(9) atom. In the sixth Tb site, Tb(6) is bonded in a 9-coordinate geometry to one Cu(3), one Te(1), one Te(10), one Te(11), one Te(13), one Te(14), one Te(4), one Te(6), and one Te(8) atom. In the seventh Tb site, Tb(7) is bonded in a 9-coordinate geometry to one Cu(3), one Te(11), one Te(13), one Te(14), one Te(15), one Te(16), one Te(3), one Te(4), and one Te(9) atom. In the eighth Tb site, Tb(8) is bonded in a 9-coordinate geometry to one Cu(1), one Te(12), one Te(14), one Te(16), one Te(2), one Te(3), one Te(5), one Te(6), and one Te(9) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(8), one Te(1), one Te(14), one Te(2), and one Te(3) atom. In the second Cu site, Cu(2) is bonded in a 7-coordinate geometry to one Tb(3), one Tb(4), one Tb(5), one Te(11), one Te(6), one Te(7), and one Te(9) atom. In the third Cu site, Cu(3) is bonded in a 7-coordinate geometry to one Tb(5), one Tb(6), one Tb(7), one Te(10), one Te(11), one Te(13), and one Te(15) atom. There are sixteen inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Tb(6), one Cu(1), one Te(12), and one Te(4) atom. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(8), and one Cu(1) atom. In the third Te site, Te(3) is bonded in a distorted trigonal bipyramidal geometry to one Tb(2), one Tb(4), one Tb(7), one Tb(8), and one Cu(1) atom. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Te(1) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), and one Tb(8) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(4), one Tb(6), one Tb(8), and one Cu(2) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(4), one Tb(5), and one Cu(2) atom. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), one Tb(8), and one Cu(2) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(3), one Tb(5), one Tb(6), and one Cu(3) atom. In the eleventh Te site, Te(11) is bonded in a 6-coordinate geometry to one Tb(4), one Tb(5), one Tb(6), one Tb(7), one Cu(2), and one Cu(3) atom. In the twelfth Te site, Te(12) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), one Tb(8), and one Te(1) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Cu(3) atom. In the fourteenth Te site, Te(14) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(6), one Tb(7), one Tb(8), and one Cu(1) atom. In the fifteenth Te site, Te(15) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(5), one Tb(7), and one Cu(3) atom. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom.
Tb8Cu3Te16 crystallizes in the triclinic P1 space group. There are eight inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(10), one Te(12), one Te(14), one Te(15), one Te(2), one Te(5), and one Te(8) atom. The Tb(1)-Cu(1) bond length is 3.20 Å. The Tb(1)-Te(1) bond length is 3.26 Å. The Tb(1)-Te(10) bond length is 3.28 Å. The Tb(1)-Te(12) bond length is 3.22 Å. The Tb(1)-Te(14) bond length is 3.09 Å. The Tb(1)-Te(15) bond length is 3.06 Å. The Tb(1)-Te(2) bond length is 3.49 Å. The Tb(1)-Te(5) bond length is 3.23 Å. The Tb(1)-Te(8) bond length is 3.21 Å. In the second Tb site, Tb(2) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(13), one Te(15), one Te(2), one Te(3), one Te(4), one Te(7), and one Te(8) atom. The Tb(2)-Cu(1) bond length is 3.37 Å. The Tb(2)-Te(1) bond length is 3.18 Å. The Tb(2)-Te(13) bond length is 3.22 Å. The Tb(2)-Te(15) bond length is 3.40 Å. The Tb(2)-Te(2) bond length is 3.08 Å. The Tb(2)-Te(3) bond length is 3.09 Å. The Tb(2)-Te(4) bond length is 3.23 Å. The Tb(2)-Te(7) bond length is 3.31 Å. The Tb(2)-Te(8) bond length is 3.22 Å. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Cu(2), one Te(10), one Te(13), one Te(16), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(9) atom. The Tb(3)-Cu(2) bond length is 3.36 Å. The Tb(3)-Te(10) bond length is 3.38 Å. The Tb(3)-Te(13) bond length is 3.23 Å. The Tb(3)-Te(16) bond length is 3.23 Å. The Tb(3)-Te(2) bond length is 3.30 Å. The Tb(3)-Te(4) bond length is 3.23 Å. The Tb(3)-Te(6) bond length is 3.10 Å. The Tb(3)-Te(7) bond length is 3.06 Å. The Tb(3)-Te(9) bond length is 3.18 Å. In the fourth Tb site, Tb(4) is bonded in a 9-coordinate geometry to one Cu(2), one Te(1), one Te(11), one Te(12), one Te(3), one Te(5), one Te(6), one Te(7), and one Te(8) atom. The Tb(4)-Cu(2) bond length is 3.18 Å. The Tb(4)-Te(1) bond length is 3.24 Å. The Tb(4)-Te(11) bond length is 3.31 Å. The Tb(4)-Te(12) bond length is 3.22 Å. The Tb(4)-Te(3) bond length is 3.35 Å. The Tb(4)-Te(5) bond length is 3.18 Å. The Tb(4)-Te(6) bond length is 3.13 Å. The Tb(4)-Te(7) bond length is 3.08 Å. The Tb(4)-Te(8) bond length is 3.21 Å. In the fifth Tb site, Tb(5) is bonded in a 10-coordinate geometry to one Cu(2), one Cu(3), one Te(10), one Te(11), one Te(12), one Te(15), one Te(16), one Te(5), one Te(7), and one Te(9) atom. The Tb(5)-Cu(2) bond length is 3.24 Å. The Tb(5)-Cu(3) bond length is 3.16 Å. The Tb(5)-Te(10) bond length is 3.11 Å. The Tb(5)-Te(11) bond length is 3.13 Å. The Tb(5)-Te(12) bond length is 3.21 Å. The Tb(5)-Te(15) bond length is 3.29 Å. The Tb(5)-Te(16) bond length is 3.20 Å. The Tb(5)-Te(5) bond length is 3.19 Å. The Tb(5)-Te(7) bond length is 3.50 Å. The Tb(5)-Te(9) bond length is 3.24 Å. In the sixth Tb site, Tb(6) is bonded in a 9-coordinate geometry to one Cu(3), one Te(1), one Te(10), one Te(11), one Te(13), one Te(14), one Te(4), one Te(6), and one Te(8) atom. The Tb(6)-Cu(3) bond length is 3.36 Å. The Tb(6)-Te(1) bond length is 3.24 Å. The Tb(6)-Te(10) bond length is 3.08 Å. The Tb(6)-Te(11) bond length is 3.11 Å. The Tb(6)-Te(13) bond length is 3.18 Å. The Tb(6)-Te(14) bond length is 3.41 Å. The Tb(6)-Te(4) bond length is 3.19 Å. The Tb(6)-Te(6) bond length is 3.32 Å. The Tb(6)-Te(8) bond length is 3.19 Å. In the seventh Tb site, Tb(7) is bonded in a 9-coordinate geometry to one Cu(3), one Te(11), one Te(13), one Te(14), one Te(15), one Te(16), one Te(3), one Te(4), and one Te(9) atom. The Tb(7)-Cu(3) bond length is 3.22 Å. The Tb(7)-Te(11) bond length is 3.50 Å. The Tb(7)-Te(13) bond length is 3.25 Å. The Tb(7)-Te(14) bond length is 3.07 Å. The Tb(7)-Te(15) bond length is 3.07 Å. The Tb(7)-Te(16) bond length is 3.19 Å. The Tb(7)-Te(3) bond length is 3.27 Å. The Tb(7)-Te(4) bond length is 3.22 Å. The Tb(7)-Te(9) bond length is 3.23 Å. In the eighth Tb site, Tb(8) is bonded in a 9-coordinate geometry to one Cu(1), one Te(12), one Te(14), one Te(16), one Te(2), one Te(3), one Te(5), one Te(6), and one Te(9) atom. The Tb(8)-Cu(1) bond length is 3.16 Å. The Tb(8)-Te(12) bond length is 3.23 Å. The Tb(8)-Te(14) bond length is 3.31 Å. The Tb(8)-Te(16) bond length is 3.20 Å. The Tb(8)-Te(2) bond length is 3.07 Å. The Tb(8)-Te(3) bond length is 3.13 Å. The Tb(8)-Te(5) bond length is 3.18 Å. The Tb(8)-Te(6) bond length is 3.39 Å. The Tb(8)-Te(9) bond length is 3.23 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(8), one Te(1), one Te(14), one Te(2), and one Te(3) atom. The Cu(1)-Te(1) bond length is 2.62 Å. The Cu(1)-Te(14) bond length is 2.68 Å. The Cu(1)-Te(2) bond length is 2.65 Å. The Cu(1)-Te(3) bond length is 2.60 Å. In the second Cu site, Cu(2) is bonded in a 7-coordinate geometry to one Tb(3), one Tb(4), one Tb(5), one Te(11), one Te(6), one Te(7), and one Te(9) atom. The Cu(2)-Te(11) bond length is 2.67 Å. The Cu(2)-Te(6) bond length is 2.58 Å. The Cu(2)-Te(7) bond length is 2.64 Å. The Cu(2)-Te(9) bond length is 2.61 Å. In the third Cu site, Cu(3) is bonded in a 7-coordinate geometry to one Tb(5), one Tb(6), one Tb(7), one Te(10), one Te(11), one Te(13), and one Te(15) atom. The Cu(3)-Te(10) bond length is 2.58 Å. The Cu(3)-Te(11) bond length is 2.65 Å. The Cu(3)-Te(13) bond length is 2.61 Å. The Cu(3)-Te(15) bond length is 2.67 Å. There are sixteen inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Tb(6), one Cu(1), one Te(12), and one Te(4) atom. The Te(1)-Te(12) bond length is 3.13 Å. The Te(1)-Te(4) bond length is 3.14 Å. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(8), and one Cu(1) atom. In the third Te site, Te(3) is bonded in a distorted trigonal bipyramidal geometry to one Tb(2), one Tb(4), one Tb(7), one Tb(8), and one Cu(1) atom. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Te(1) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), and one Tb(8) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(4), one Tb(6), one Tb(8), and one Cu(2) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(4), one Tb(5), and one Cu(2) atom. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), one Tb(8), and one Cu(2) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(3), one Tb(5), one Tb(6), and one Cu(3) atom. In the eleventh Te site, Te(11) is bonded in a 6-coordinate geometry to one Tb(4), one Tb(5), one Tb(6), one Tb(7), one Cu(2), and one Cu(3) atom. In the twelfth Te site, Te(12) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), one Tb(8), and one Te(1) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Cu(3) atom. In the fourteenth Te site, Te(14) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(6), one Tb(7), one Tb(8), and one Cu(1) atom. In the fifteenth Te site, Te(15) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(5), one Tb(7), and one Cu(3) atom. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom.