Cr(Mo3Se4)2 crystallizes in the trigonal R-3 space group. Mo(1) is bonded to one Se(2) and four equivalent Se(1) atoms to form a mixture of distorted corner and edge-sharing MoSe5 square pyramids. Cr(1) is bonded in a distorted body-centered cubic geometry to two equivalent Se(2) and six equivalent Se(1) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent Mo(1) and one Cr(1) atom. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to three equivalent Mo(1) and one Cr(1) atom.
Cr(Mo3Se4)2 crystallizes in the trigonal R-3 space group. Mo(1) is bonded to one Se(2) and four equivalent Se(1) atoms to form a mixture of distorted corner and edge-sharing MoSe5 square pyramids. The Mo(1)-Se(2) bond length is 2.55 Å. There are a spread of Mo(1)-Se(1) bond distances ranging from 2.57-2.71 Å. Cr(1) is bonded in a distorted body-centered cubic geometry to two equivalent Se(2) and six equivalent Se(1) atoms. Both Cr(1)-Se(2) bond lengths are 2.51 Å. All Cr(1)-Se(1) bond lengths are 3.15 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent Mo(1) and one Cr(1) atom. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to three equivalent Mo(1) and one Cr(1) atom.