CdSe2 is Pyrite structured and crystallizes in the cubic Pa-3 space group. Cd(1) is bonded to six equivalent Se(1) atoms to form CdSe6 octahedra that share corners with twelve equivalent Cd(1)Se6 octahedra and corners with six equivalent Se(1)Cd3Se tetrahedra. The corner-sharing octahedral tilt angles are 67°. Se(1) is bonded to three equivalent Cd(1) and one Se(1) atom to form SeCd3Se tetrahedra that share corners with three equivalent Cd(1)Se6 octahedra and corners with fifteen equivalent Se(1)Cd3Se tetrahedra. The corner-sharing octahedral tilt angles are 75°.
CdSe2 is Pyrite structured and crystallizes in the cubic Pa-3 space group. Cd(1) is bonded to six equivalent Se(1) atoms to form CdSe6 octahedra that share corners with twelve equivalent Cd(1)Se6 octahedra and corners with six equivalent Se(1)Cd3Se tetrahedra. The corner-sharing octahedral tilt angles are 67°. All Cd(1)-Se(1) bond lengths are 2.85 Å. Se(1) is bonded to three equivalent Cd(1) and one Se(1) atom to form SeCd3Se tetrahedra that share corners with three equivalent Cd(1)Se6 octahedra and corners with fifteen equivalent Se(1)Cd3Se tetrahedra. The corner-sharing octahedral tilt angles are 75°. The Se(1)-Se(1) bond length is 2.40 Å.