Cs2Se crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Se(1) atoms. In the second Cs site, Cs(2) is bonded in a 4-coordinate geometry to four equivalent Se(1) atoms. Se(1) is bonded in a 8-coordinate geometry to four equivalent Cs(1) and four equivalent Cs(2) atoms.
Cs2Se crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Se(1) atoms. There are two shorter (3.69 Å) and two longer (3.86 Å) Cs(1)-Se(1) bond lengths. In the second Cs site, Cs(2) is bonded in a 4-coordinate geometry to four equivalent Se(1) atoms. There are a spread of Cs(2)-Se(1) bond distances ranging from 3.54-3.93 Å. Se(1) is bonded in a 8-coordinate geometry to four equivalent Cs(1) and four equivalent Cs(2) atoms.