OsSe2 is Pyrite-like structured and crystallizes in the cubic Pa-3 space group. Os(1) is bonded to six equivalent Se(1) atoms to form OsSe6 octahedra that share corners with twelve equivalent Os(1)Se6 octahedra and corners with six equivalent Se(1)Os3Se tetrahedra. The corner-sharing octahedral tilt angles are 63°. Se(1) is bonded to three equivalent Os(1) and one Se(1) atom to form distorted SeOs3Se tetrahedra that share corners with three equivalent Os(1)Se6 octahedra and corners with fifteen equivalent Se(1)Os3Se tetrahedra. The corner-sharing octahedral tilt angles are 79°.
OsSe2 is Pyrite-like structured and crystallizes in the cubic Pa-3 space group. Os(1) is bonded to six equivalent Se(1) atoms to form OsSe6 octahedra that share corners with twelve equivalent Os(1)Se6 octahedra and corners with six equivalent Se(1)Os3Se tetrahedra. The corner-sharing octahedral tilt angles are 63°. All Os(1)-Se(1) bond lengths are 2.48 Å. Se(1) is bonded to three equivalent Os(1) and one Se(1) atom to form distorted SeOs3Se tetrahedra that share corners with three equivalent Os(1)Se6 octahedra and corners with fifteen equivalent Se(1)Os3Se tetrahedra. The corner-sharing octahedral tilt angles are 79°. The Se(1)-Se(1) bond length is 2.52 Å.