CeSe2 crystallizes in the hexagonal P6/mmm space group. Ce(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of edge and face-sharing CeSe12 cuboctahedra. Se(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Se(1) atoms.
CeSe2 crystallizes in the hexagonal P6/mmm space group. Ce(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of edge and face-sharing CeSe12 cuboctahedra. All Ce(1)-Se(1) bond lengths are 3.30 Å. Se(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Se(1) atoms. All Se(1)-Se(1) bond lengths are 2.77 Å.