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CeSe2 is trigonal omega-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is two-dimensional and consists of two CeSe2 sheets oriented in the (0, 0, 1) direction. Ce4+ is bonded to six equivalent Se2- atoms to form edge-sharing CeSe6 octahedra. All Ce–Se bond lengths are 2.87 Å. Se2- is bonded in a distorted T-shaped geometry to three equivalent Ce4+ atoms.
CeSe2 crystallizes in the orthorhombic Pcca space group. The structure is three-dimensional. Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. There are a spread of Ce–Se bond distances ranging from 2.71–2.73 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a bent 120 degrees geometry to two equivalent Ce4+ atoms. In the second Se2- site, Se2- is bonded in a bent 120 degrees geometry to two equivalent Ce4+ atoms. In the third Se2- site, Se2- is bonded in a linear geometry to two equivalent Ce4+ atoms. In the fourth Se2- site, Se2- is bonded in a bent 120 degrees geometry to two equivalent Ce4+ atoms.
CeSe2 is Molybdenite-like structured and crystallizes in the monoclinic C2 space group. The structure is two-dimensional and consists of one CeSe2 sheet oriented in the (0, 0, 1) direction. Ce4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing CeSe6 pentagonal pyramids. All Ce–Se bond lengths are 2.90 Å. Se2- is bonded in a distorted T-shaped geometry to three equivalent Ce4+ atoms.
CeSe2 is Low Tridymite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. There are a spread of Ce–Se bond distances ranging from 2.71–2.73 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the second Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the third Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms. In the fourth Se2- site, Se2- is bonded in a bent 150 degrees geometry to two equivalent Ce4+ atoms.
CeSe2 crystallizes in the cubic Ia-3 space group. The structure is three-dimensional. Ce4+ is bonded to four Se2- atoms to form corner-sharing CeSe4 tetrahedra. There are a spread of Ce–Se bond distances ranging from 2.72–2.74 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a bent 120 degrees geometry to two equivalent Ce4+ atoms. In the second Se2- site, Se2- is bonded in a bent 120 degrees geometry to two equivalent Ce4+ atoms. In the third Se2- site, Se2- is bonded in a linear geometry to two equivalent Ce4+ atoms.
CeSe2 is Hydrophilite-like structured and crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Ce4+ is bonded to six equivalent Se2- atoms to form a mixture of corner and edge-sharing CeSe6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ce–Se bond distances ranging from 2.85–2.90 Å. Se2- is bonded in a distorted trigonal planar geometry to three equivalent Ce4+ atoms.
CeSe2 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Ce4+ is bonded to six Se2- atoms to form a mixture of edge and corner-sharing CeSe6 octahedra. The corner-sharing octahedra tilt angles range from 6–22°. There are a spread of Ce–Se bond distances ranging from 2.70–3.05 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted see-saw-like geometry to four equivalent Ce4+ atoms. In the second Se2- site, Se2- is bonded in a linear geometry to two equivalent Ce4+ atoms.
CeSe2 is Molybdenite-like structured and crystallizes in the hexagonal P-6m2 space group. The structure is two-dimensional and consists of four CeSe2 sheets oriented in the (0, 0, 1) direction. Ce4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing CeSe6 pentagonal pyramids. All Ce–Se bond lengths are 2.91 Å. Se2- is bonded in a distorted T-shaped geometry to three equivalent Ce4+ atoms.
CeSe2 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. Ce4+ is bonded to six equivalent Se2- atoms to form a mixture of distorted edge and corner-sharing CeSe6 pentagonal pyramids. There are two shorter (2.84 Å) and four longer (2.86 Å) Ce–Se bond lengths. Se2- is bonded in a distorted T-shaped geometry to three equivalent Ce4+ atoms.
CeSe2 is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of six CeSe2 sheets oriented in the (0, 0, 1) direction. Ce4+ is bonded to six equivalent Se2- atoms to form edge-sharing CeSe6 octahedra. All Ce–Se bond lengths are 2.87 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ce4+ atoms.