CeSe2 is Rutile-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 one Se(2), two equivalent Se(1), and three equivalent Se(3) atoms to form a mixture of corner and edge-sharing CeSe6 octahedra. The corner-sharing octahedral tilt angles range from 21-55°. In the second Ce site, Ce(2) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing CeSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal planar geometry to one Ce(2) and two equivalent Ce(1) atoms. In the second Se site, Se(2) is bonded in a trigonal planar geometry to one Ce(1) and two equivalent Ce(2) atoms. In the third Se site, Se(3) is bonded in a T-shaped geometry to three equivalent Ce(1) atoms.
CeSe2 is Rutile-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 one Se(2), two equivalent Se(1), and three equivalent Se(3) atoms to form a mixture of corner and edge-sharing CeSe6 octahedra. The corner-sharing octahedral tilt angles range from 21-55°. The Ce(1)-Se(2) bond length is 2.90 Å. There is one shorter (2.84 Å) and one longer (2.86 Å) Ce(1)-Se(1) bond length. There is one shorter (2.84 Å) and two longer (2.86 Å) Ce(1)-Se(3) bond lengths. In the second Ce site, Ce(2) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing CeSe6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. Both Ce(2)-Se(1) bond lengths are 2.89 Å. There are two shorter (2.85 Å) and two longer (2.86 Å) Ce(2)-Se(2) bond lengths. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal planar geometry to one Ce(2) and two equivalent Ce(1) atoms. In the second Se site, Se(2) is bonded in a trigonal planar geometry to one Ce(1) and two equivalent Ce(2) atoms. In the third Se site, Se(3) is bonded in a T-shaped geometry to three equivalent Ce(1) atoms.