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TaSe2 is trigonal omega structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one TaSe2 sheet oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form edge-sharing TaSe6 octahedra. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the trigonal R3m space group. The structure is two-dimensional and consists of six TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form edge-sharing TaSe6 octahedra. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe3 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one TaSe3 sheet oriented in the (1, 0, -1) direction. there are two inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded in a 8-coordinate geometry to eight Se+1.67- atoms. There are a spread of Ta–Se bond distances ranging from 2.65–2.84 Å. In the second Ta5+ site, Ta5+ is bonded in a 8-coordinate geometry to eight Se+1.67- atoms. There are a spread of Ta–Se bond distances ranging from 2.63–2.78 Å. There are six inequivalent Se+1.67- sites. In the first Se+1.67- site, Se+1.67- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ta5+ atoms. In the second Se+1.67- site, Se+1.67- is bonded in a distorted trigonal non-coplanar geometry to three Ta5+ atoms. In the third Se+1.67- site, Se+1.67- is bonded in a distorted L-shaped geometry to two equivalent Ta5+ atoms. In the fourth Se+1.67- site, Se+1.67- is bonded in a distorted L-shaped geometry to two equivalent Ta5+ atoms. In the fifth Se+1.67- site, Se+1.67- is bonded in a 2-coordinate geometry to two equivalent Ta5+ atoms. In the sixth Se+1.67- site, Se+1.67- is bonded to four Ta5+ atoms to form a mixture of distorted corner and edge-sharing SeTa4 tetrahedra.
TaSe2 is Molybdenite-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is two-dimensional and consists of two TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.62 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is two-dimensional and consists of four TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form edge-sharing TaSe6 octahedra. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form edge-sharing TaSe6 octahedra. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the hexagonal P-6m2 space group. The structure is two-dimensional and consists of four TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.62 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the trigonal R3m space group. The structure is two-dimensional and consists of three TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.62 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the hexagonal P6_3mc space group. The structure is two-dimensional and consists of four TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.62 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
Ta2Se crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of two Ta2Se sheets oriented in the (0, 0, 1) direction. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded in a 4-coordinate geometry to four equivalent Se atoms. All Ta–Se bond lengths are 2.70 Å. In the second Ta site, Ta is bonded in a distorted single-bond geometry to one Se atom. The Ta–Se bond length is 2.85 Å. Se is bonded in a 5-coordinate geometry to five Ta atoms.
TaSe2 is Molybdenite-like structured and crystallizes in the orthorhombic Fmm2 space group. The structure is two-dimensional and consists of two TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.62 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms. In the fourth Se2- site, Se2- is bonded in a distorted T-shaped geometry to three equivalent Ta4+ atoms.
Ta2Se3 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Ta3+ sites. In the first Ta3+ site, Ta3+ is bonded to six Se2- atoms to form edge-sharing TaSe6 octahedra. There are a spread of Ta–Se bond distances ranging from 2.53–2.75 Å. In the second Ta3+ site, Ta3+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of Ta–Se bond distances ranging from 2.58–3.03 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta3+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to five Ta3+ atoms. In the third Se2- site, Se2- is bonded in a 4-coordinate geometry to four Ta3+ atoms.
TaSe2 is Molybdenite structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is two-dimensional and consists of two TaSe2 sheets oriented in the (0, 0, 1) direction. Ta4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.
TaSe3 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one TaSe3 sheet oriented in the (1, 0, -1) direction. there are three inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded in a 8-coordinate geometry to eight Se+1.67- atoms. There are a spread of Ta–Se bond distances ranging from 2.65–2.79 Å. In the second Ta5+ site, Ta5+ is bonded in a 8-coordinate geometry to eight Se+1.67- atoms. There are a spread of Ta–Se bond distances ranging from 2.65–2.98 Å. In the third Ta5+ site, Ta5+ is bonded in a 8-coordinate geometry to eight Se+1.67- atoms. There are a spread of Ta–Se bond distances ranging from 2.65–2.79 Å. There are nine inequivalent Se+1.67- sites. In the first Se+1.67- site, Se+1.67- is bonded in a 4-coordinate geometry to four Ta5+ atoms. In the second Se+1.67- site, Se+1.67- is bonded in a 2-coordinate geometry to two equivalent Ta5+ atoms. In the third Se+1.67- site, Se+1.67- is bonded in a distorted L-shaped geometry to two equivalent Ta5+ atoms. In the fourth Se+1.67- site, Se+1.67- is bonded in a distorted L-shaped geometry to two equivalent Ta5+ atoms. In the fifth Se+1.67- site, Se+1.67- is bonded in a distorted trigonal non-coplanar geometry to three Ta5+ atoms. In the sixth Se+1.67- site, Se+1.67- is bonded in a 3-coordinate geometry to three Ta5+ atoms. In the seventh Se+1.67- site, Se+1.67- is bonded in a 2-coordinate geometry to two equivalent Ta5+ atoms. In the eighth Se+1.67- site, Se+1.67- is bonded in a 4-coordinate geometry to four Ta5+ atoms. In the ninth Se+1.67- site, Se+1.67- is bonded in a 2-coordinate geometry to two equivalent Ta5+ atoms.