Nb6SnSe8 crystallizes in the trigonal P-3 space group. Nb(1) is bonded in a 6-coordinate geometry to two equivalent Se(2) and four equivalent Se(1) atoms. Sn(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to six equivalent Nb(1) atoms to form distorted face-sharing SeNb6 pentagonal pyramids. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to four equivalent Nb(1) and one Sn(1) atom.
Nb6SnSe8 crystallizes in the trigonal P-3 space group. Nb(1) is bonded in a 6-coordinate geometry to two equivalent Se(2) and four equivalent Se(1) atoms. Both Nb(1)-Se(2) bond lengths are 2.73 Å. There are a spread of Nb(1)-Se(1) bond distances ranging from 2.61-2.82 Å. Sn(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. All Sn(1)-Se(1) bond lengths are 3.27 Å. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to six equivalent Nb(1) atoms to form distorted face-sharing SeNb6 pentagonal pyramids. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to four equivalent Nb(1) and one Sn(1) atom.