Na(Nb3Se4)2 crystallizes in the trigonal P-3 space group. Na(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. Nb(1) is bonded in a 6-coordinate geometry to two equivalent Se(2) and four 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 5-coordinate geometry to one Na(1) and four equivalent Nb(1) atoms.
Na(Nb3Se4)2 crystallizes in the trigonal P-3 space group. Na(1) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. All Na(1)-Se(1) bond lengths are 3.27 Å. 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 2.74 Å. There are a spread of Nb(1)-Se(1) bond distances ranging from 2.61-2.84 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 5-coordinate geometry to one Na(1) and four equivalent Nb(1) atoms.