CeSe2 is quartz (alpha)-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent Se(2) and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(3), and two equivalent Se(1) atoms to form corner-sharing CeSe4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the second Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the third Se site, Se(3) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom.
CeSe2 is quartz (alpha)-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to two equivalent Se(2) and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. Both Ce(1)-Se(2) bond lengths are 2.73 Å. Both Ce(1)-Se(3) bond lengths are 2.72 Å. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(3), and two equivalent Se(1) atoms to form corner-sharing CeSe4 tetrahedra. The Ce(2)-Se(2) bond length is 2.72 Å. The Ce(2)-Se(3) bond length is 2.72 Å. There is one shorter (2.71 Å) and one longer (2.72 Å) Ce(2)-Se(1) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the second Se site, Se(2) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the third Se site, Se(3) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom.