Nb6TlTe8 crystallizes in the trigonal P-3 space group. Nb(1) is bonded in a 6-coordinate geometry to two equivalent Te(1) and four equivalent Te(2) atoms. Tl(1) is bonded in a 6-coordinate geometry to six equivalent Te(2) atoms. There are two inequivalent Te sites. In the first Te site, Te(2) is bonded in a 5-coordinate geometry to four equivalent Nb(1) and one Tl(1) atom. In the second Te site, Te(1) is bonded to six equivalent Nb(1) atoms to form distorted face-sharing TeNb6 pentagonal pyramids.
Nb6TlTe8 crystallizes in the trigonal P-3 space group. Nb(1) is bonded in a 6-coordinate geometry to two equivalent Te(1) and four equivalent Te(2) atoms. Both Nb(1)-Te(1) bond lengths are 2.93 Å. There are a spread of Nb(1)-Te(2) bond distances ranging from 2.80-3.04 Å. Tl(1) is bonded in a 6-coordinate geometry to six equivalent Te(2) atoms. All Tl(1)-Te(2) bond lengths are 3.49 Å. There are two inequivalent Te sites. In the first Te site, Te(2) is bonded in a 5-coordinate geometry to four equivalent Nb(1) and one Tl(1) atom. In the second Te site, Te(1) is bonded to six equivalent Nb(1) atoms to form distorted face-sharing TeNb6 pentagonal pyramids.