Cs2CoSe2 crystallizes in the orthorhombic Ibam space group. Cs(1) is bonded in a 8-coordinate geometry to two equivalent Co(1) and six equivalent Se(1) atoms. Co(1) is bonded to four equivalent Cs(1) and four equivalent Se(1) atoms to form distorted face-sharing CoCs4Se4 tetrahedra. Se(1) is bonded in a 8-coordinate geometry to six equivalent Cs(1) and two equivalent Co(1) atoms.
Cs2CoSe2 crystallizes in the orthorhombic Ibam space group. Cs(1) is bonded in a 8-coordinate geometry to two equivalent Co(1) and six equivalent Se(1) atoms. Both Cs(1)-Co(1) bond lengths are 3.65 Å. There are a spread of Cs(1)-Se(1) bond distances ranging from 3.63-3.93 Å. Co(1) is bonded to four equivalent Cs(1) and four equivalent Se(1) atoms to form distorted face-sharing CoCs4Se4 tetrahedra. All Co(1)-Se(1) bond lengths are 2.46 Å. Se(1) is bonded in a 8-coordinate geometry to six equivalent Cs(1) and two equivalent Co(1) atoms.