Square antiprismatic molecular geometry (original) (raw)
化学において、反四角柱形分子構造（はんしかくちゅうけいぶんしこうぞう、英: Square antiprismatic molecular geometry）は、中心原子の周りに8つの原子または原子のグループまたは配位子がの各頂点に配置された化合物の構造をいう。四方逆プリズム形とも。
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| dbo:abstract | En chimie, une géométrie moléculaire antiprismatique carrée est la géométrie des molécules où un atome central, noté A, est lié à huit atomes, groupe d'atomes ou ligands, notés X, formant les sommets d'un antiprisme carré. Cette configuration est notée AX8E0 selon la théorie VSEPR. Comme la plupart des composés hautement coordinés, les composés octacoordinés présentent souvent une structure réelle distordue par rapport à la géométrie idéalisée. C'est par exemple le cas de Na3TaF8, où, du fait du faible nombre d'ions Na+, les forces réticulaires sont fortes. Pour des cations diatomiques comme NO+, elles sont plus faibles, ce qui explique pourquoi un composé comme (NO)2XeF8 cristallise avec une structure plus proche de la géométrie idéalisée d'un antiprisme carré. * L'antiprisme carré distordu de l'anion [TaF8]3− de la structure de Na3TaF8 . * L'antiprisme carré de l'anion [XeF8]2− de la structure de l'octafluoroxénate(VI) de nitrosonium, (NO)2XeF8. (fr) In chemistry, the square antiprismatic molecular geometry describes the shape of compounds where eight atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a square antiprism. This shape has D4d symmetry and is one of the three common shapes for octacoordinate transition metal complexes, along with the dodecahedron and the bicapped trigonal prism. Like with other high coordination numbers, eight-coordinate compounds are often distorted from idealized geometries, as illustrated by the structure of Na3TaF8. In this case, with the small Na+ ions, lattice forces are strong. With the diatomic cation NO+, the lattice forces are weaker, such as in (NO)2XeF8, which crystallizes with a more idealized square antiprismatic geometry. * The distorted square antiprismatic [TaF8]3− anion in the Na3TaF8 lattice. * The square antiprismatic [XeF8]2− anion in the lattice of nitrosonium octafluoroxenate(VI), (NO)2XeF8. * Structure of the Bi82+ cluster in the [Bi8](GaCl4)2. (en) 化学において、反四角柱形分子構造（はんしかくちゅうけいぶんしこうぞう、英: Square antiprismatic molecular geometry）は、中心原子の周りに8つの原子または原子のグループまたは配位子がの各頂点に配置された化合物の構造をいう。四方逆プリズム形とも。 (ja) Na química, a geometria molecular antiprismática quadrada descreve a forma de alguns compostos com NCT 8, ou seja, compostos nos quais oito átomos, grupos de átomos ou ligantes são arranjados ao redor de um mesmo átomo central, definindo os vértices de um antiprisma quadrado. Ela ocorre quando não há rigidez estereoquímica e é relativamente rara. Ela é a geometria de menor energia possível dentre as três configurações conhecidas para o número de coordenação 8. (pt) 方形反稜柱分子構型是描述一種有八個原子、或配體連接在一個中心原子周圍的分子構型，其分子形狀類似正四角反稜柱。像八氟合氙(VI)酸亞硝醯(NO)2XeF8中的XeF82−離子即為此構型。 方形反稜柱分子構型是八配位的過渡金屬配合物中，常見的三種分子構型之一，另外兩種是及。 (zh) |
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| rdfs:comment | 化学において、反四角柱形分子構造（はんしかくちゅうけいぶんしこうぞう、英: Square antiprismatic molecular geometry）は、中心原子の周りに8つの原子または原子のグループまたは配位子がの各頂点に配置された化合物の構造をいう。四方逆プリズム形とも。 (ja) Na química, a geometria molecular antiprismática quadrada descreve a forma de alguns compostos com NCT 8, ou seja, compostos nos quais oito átomos, grupos de átomos ou ligantes são arranjados ao redor de um mesmo átomo central, definindo os vértices de um antiprisma quadrado. Ela ocorre quando não há rigidez estereoquímica e é relativamente rara. Ela é a geometria de menor energia possível dentre as três configurações conhecidas para o número de coordenação 8. (pt) 方形反稜柱分子構型是描述一種有八個原子、或配體連接在一個中心原子周圍的分子構型，其分子形狀類似正四角反稜柱。像八氟合氙(VI)酸亞硝醯(NO)2XeF8中的XeF82−離子即為此構型。 方形反稜柱分子構型是八配位的過渡金屬配合物中，常見的三種分子構型之一，另外兩種是及。 (zh) En chimie, une géométrie moléculaire antiprismatique carrée est la géométrie des molécules où un atome central, noté A, est lié à huit atomes, groupe d'atomes ou ligands, notés X, formant les sommets d'un antiprisme carré. Cette configuration est notée AX8E0 selon la théorie VSEPR. * L'antiprisme carré distordu de l'anion [TaF8]3− de la structure de Na3TaF8 . * L'antiprisme carré de l'anion [XeF8]2− de la structure de l'octafluoroxénate(VI) de nitrosonium, (NO)2XeF8. (fr) In chemistry, the square antiprismatic molecular geometry describes the shape of compounds where eight atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a square antiprism. This shape has D4d symmetry and is one of the three common shapes for octacoordinate transition metal complexes, along with the dodecahedron and the bicapped trigonal prism. * The distorted square antiprismatic [TaF8]3− anion in the Na3TaF8 lattice. * The square antiprismatic [XeF8]2− anion in the lattice of nitrosonium octafluoroxenate(VI), (NO)2XeF8. * (en) |
| rdfs:label | Géométrie moléculaire antiprismatique carrée (fr) 反四角柱形分子構造 (ja) Geometria molecular antiprismática quadrada (pt) Square antiprismatic molecular geometry (en) 四角反棱柱形分子构型 (zh) |
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