Cs2Se is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 5-coordinate geometry to five equivalent Se(1) atoms. In the second Cs site, Cs(2) is bonded to four equivalent Se(1) atoms to form a mixture of edge and corner-sharing CsSe4 tetrahedra. Se(1) is bonded in a 9-coordinate geometry to four equivalent Cs(2) and five equivalent Cs(1) atoms.
Cs2Se is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 5-coordinate geometry to five equivalent Se(1) atoms. There are a spread of Cs(1)-Se(1) bond distances ranging from 3.66-4.17 Å. In the second Cs site, Cs(2) is bonded to four equivalent Se(1) atoms to form a mixture of edge and corner-sharing CsSe4 tetrahedra. There are a spread of Cs(2)-Se(1) bond distances ranging from 3.54-3.61 Å. Se(1) is bonded in a 9-coordinate geometry to four equivalent Cs(2) and five equivalent Cs(1) atoms.