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rdfs:label
Tetrahedral molecular geometry Géométrie moléculaire tétraédrique Tetraedrisk geometri Tetraëdrische moleculaire geometrie Geometría molecular tetraédrica Struktur molekul tetrahedron Geometria molecular tetraèdrica بنية جزيئية رباعية السطوح 四面体形分子構造 四面体形分子构型 사면체형 분자기하 Geometria molecular tetraédrica
rdfs:comment
Struktur molekul tetrahedron atau tetrahedral memiliki satu atom sebagai pusat dan empat substituen yang tersusun dalam bentuk limas segitiga, atau tetrahedron ("empat muka"). Contoh molekul dengan struktur tetrahedral adalah metana (CH4). Atom karbon dalam molekul ini terikat dengan atom-atom hidrogen melalui empat pasang , tanpa pasangan elektron bebas. Keempatnya tersusun dengan sudut yang sama (109,5°), menghasilkan bangun ruang limas segitiga: empat atom hidrogen di sudut-sudutnya, dan satu atom karbon di tengah-tengah. Keempat muka limas ini berbentuk segitiga sama sisi. La geometría molecular tetraédrica es una clase de geometría molecular en la que un átomo central se encuentra en el centro enlazado químicamente con cuatro sustituyentes que se encuentran en las esquinas de un tetraedro. Algunos ejemplos de especies químicas con esta geometría son el metano (CH4), el ion amonio (NH4+), o los aniones sulfato (SO42-) y fosfato (PO43-). Em uma geometria molecular tetraédrica, um átomo central está localizado no centro com quatro substituintes que estão localizados nos cantos de um tetraedro. Os ângulos de ligação são cos−1(−⅓) = 109.4712206...° ≈ 109.5° quando todos os quatro substituintes são iguais, como no metano (CH4), bem como em . O metano e outras moléculas tetraédricas perfeitamente simétricas pertencem ao grupo de pontos Td, mas a maioria das moléculas tetraédricas possui menor simetria. Moléculas tetraédricas podem ser quirais. 化学において、四面体形分子構造(しめんたいがたぶんしこうぞう、Tetrahedral molecular geometry)とは、中心原子に配位する4個の置換基が四面体の頂点に位置した分子の幾何配置のことである。メタンやその他ののように、4個の置換基がすべて同じときその結合角はcos−1(−1/3) = 109.4712206...° ≈ 109.5°である。この完全に対称な四面体は点群Tdに属するが、ほとんどの四面体分子はそれほど対称性は高くない。四面体分子はキラルになることができる。 四面体形分子构型是指一分子中的中心原子和四個原子鍵結,四個原子形成四面體4個頂點的分子构型。若和中心原子鍵結的4個原子都是同一種原子(例如甲烷CH4),則其鍵角為cos−1(−1/3) ≈ 109.5°。週期表中有許多元素的化合物都是四面体形分子构型,理想分子有Td的對稱點群,但大部份四面体形构型分子的對稱性較低。四面体分子可能會具有手性。 En chimie, la géométrie moléculaire tétraédrique est la géométrie des molécules où un atome central, noté A, est lié à quatre atomes, notés X, aux sommets d'un tétraèdre régulier (ou presque régulier). Ces composés appartiennent à la classe AX4E0 selon la théorie VSEPR. La geometria molecular tetraèdrica és un tipus de geometria molecular en la qual un àtom central es troba al centre enllaçat químicament amb quatre substituents que es troben en les cantonades d'un tetraedre. Alguns exemples d'espècies químiques amb aquesta geometria són el metà (CH₄), l'ió amoni NH₄+), o els anions sulfat (SO₄2-) i fosfat (PO₄3-). In de scheikunde verwijst een tetraëdrische moleculaire geometrie naar moleculen waarbij een centraal atoom omringd wordt door 4 atomen, die elk op de hoekpunten van een denkbeeldige tetraëder zijn gelegen. De bindingshoeken bedragen ongeveer 109,5° wanneer de 4 atomen gelijk zijn. Een klassiek voorbeeld hiervan is methaan. De perfecte tetraëdrische moleculen behoren tot puntgroep Td. Tetraedrisk geometri är en mycket vanlig molekylär geometri med 4. I idealfallet kan en tetraedrisk molekyl skrivas som AX4, där A ofta är sp3-hybridiserad och samtliga X identiska. I en sådan molekyl är bindningsvinklarna cos-1(-1/3) ≈ 109,5° och det elektriska dipolmomentet är 0, eftersom molekylen är fullständigt symmetrisk. Exempel på plantrigonala molekyler/joner är metan CH4, ammoniumjonen NH4+ sulfatjonen SO42- och fosfatjonen PO43-. I fall som avviker från idealfallet, där alla X inte är identiska, finns kolen i alkankedjor (etan), halogenalkaner etc. 화학에서 사면체형 분자기하(四面體形分子幾何, Tetrahedral molecular geometry)는 중심원자에 배위하는 4개의 치환기가 사면체의 꼭짓점에 위치하는 분자의 기하배치를 말한다. 메탄 및 기타 과 같이, 4개의 치환기가 모두 같을 때, 그 결합각은 cos−1(−1/3) = 109.4712206...° ≈109.5°이다. 이 완벽하게 대칭인 사면체는 점군 Td에 속하지만, 대부분의 사면체 분자는 그만큼 대칭은 높지 않다. 정사면체 분자는 카이랄이 될 수 있다. In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron. The bond angles are cos−1(−1⁄3) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH4) as well as its heavier analogues. Methane and other perfectly symmetrical tetrahedral molecules belong to point group Td, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules can be chiral. البنية الجزيئية رباعية السطوح هي بنية جزيئية يكون فيها ذرة مركزية يحيط بها أربع متبادلات، تكون واقعة على زوايا رباعي سطوح. تكون الزوايا بين الروابط في هذه البنية cos−1(−1/3) ≈ 109.5°، وذلك عندما تكون المستبدلات الطرفية ذاتها، كما في غاز الميثان CH4. ينتمي رباعي السطوح ذو التناظر التام إلى الزمرة النقطية Td، ولكن في الواقع فإن أغلب الجزيئات لا يكون لها ذلك التناظر التام.
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Struktur molekul tetrahedron atau tetrahedral memiliki satu atom sebagai pusat dan empat substituen yang tersusun dalam bentuk limas segitiga, atau tetrahedron ("empat muka"). Contoh molekul dengan struktur tetrahedral adalah metana (CH4). Atom karbon dalam molekul ini terikat dengan atom-atom hidrogen melalui empat pasang , tanpa pasangan elektron bebas. Keempatnya tersusun dengan sudut yang sama (109,5°), menghasilkan bangun ruang limas segitiga: empat atom hidrogen di sudut-sudutnya, dan satu atom karbon di tengah-tengah. Keempat muka limas ini berbentuk segitiga sama sisi. 四面体形分子构型是指一分子中的中心原子和四個原子鍵結,四個原子形成四面體4個頂點的分子构型。若和中心原子鍵結的4個原子都是同一種原子(例如甲烷CH4),則其鍵角為cos−1(−1/3) ≈ 109.5°。週期表中有許多元素的化合物都是四面体形分子构型,理想分子有Td的對稱點群,但大部份四面体形构型分子的對稱性較低。四面体分子可能會具有手性。 Tetraedrisk geometri är en mycket vanlig molekylär geometri med 4. I idealfallet kan en tetraedrisk molekyl skrivas som AX4, där A ofta är sp3-hybridiserad och samtliga X identiska. I en sådan molekyl är bindningsvinklarna cos-1(-1/3) ≈ 109,5° och det elektriska dipolmomentet är 0, eftersom molekylen är fullständigt symmetrisk. Exempel på plantrigonala molekyler/joner är metan CH4, ammoniumjonen NH4+ sulfatjonen SO42- och fosfatjonen PO43-. I fall som avviker från idealfallet, där alla X inte är identiska, finns kolen i alkankedjor (etan), halogenalkaner etc. In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron. The bond angles are cos−1(−1⁄3) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH4) as well as its heavier analogues. Methane and other perfectly symmetrical tetrahedral molecules belong to point group Td, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules can be chiral. En chimie, la géométrie moléculaire tétraédrique est la géométrie des molécules où un atome central, noté A, est lié à quatre atomes, notés X, aux sommets d'un tétraèdre régulier (ou presque régulier). Ces composés appartiennent à la classe AX4E0 selon la théorie VSEPR. Les angles de liaison sont de ≈ 109,47° (double de l'angle dit « magique ») lorsque tous les substituants sont les mêmes, comme dans le cas du méthane (CH4). Les tétraèdres parfaitement symétriques appartiennent au groupe ponctuel de symétrie Td, mais la plupart des molécules tétraédriques ne possèdent pas une si forte symétrie. Les molécules tétraédriques peuvent être chirales. Cette géométrie est proche de la géométrie moléculaire pyramidale trigonale (AX3E1), où la place de l'un des substituants est tenue par un doublet non liant. Dans cette géométrie les angles de liaison sont inférieurs à 109,5°, par exemple 107° dans le cas de l'ammoniac. Cette légère contraction résulte de la plus forte répulsion que ce doublet non liant, par rapport à un substituant, exerce sur les autres substituants. 화학에서 사면체형 분자기하(四面體形分子幾何, Tetrahedral molecular geometry)는 중심원자에 배위하는 4개의 치환기가 사면체의 꼭짓점에 위치하는 분자의 기하배치를 말한다. 메탄 및 기타 과 같이, 4개의 치환기가 모두 같을 때, 그 결합각은 cos−1(−1/3) = 109.4712206...° ≈109.5°이다. 이 완벽하게 대칭인 사면체는 점군 Td에 속하지만, 대부분의 사면체 분자는 그만큼 대칭은 높지 않다. 정사면체 분자는 카이랄이 될 수 있다. La geometría molecular tetraédrica es una clase de geometría molecular en la que un átomo central se encuentra en el centro enlazado químicamente con cuatro sustituyentes que se encuentran en las esquinas de un tetraedro. Algunos ejemplos de especies químicas con esta geometría son el metano (CH4), el ion amonio (NH4+), o los aniones sulfato (SO42-) y fosfato (PO43-). In de scheikunde verwijst een tetraëdrische moleculaire geometrie naar moleculen waarbij een centraal atoom omringd wordt door 4 atomen, die elk op de hoekpunten van een denkbeeldige tetraëder zijn gelegen. De bindingshoeken bedragen ongeveer 109,5° wanneer de 4 atomen gelijk zijn. Een klassiek voorbeeld hiervan is methaan. De perfecte tetraëdrische moleculen behoren tot puntgroep Td. Naast verzadigde organische verbindingen komen ook de meeste verbindingen van silicium, germanium en tin voor als tetraëders. Andere voorbeelden van tetraëdrische verbindingen zijn , osmium(VIII)oxide en de ionen perchloraat, tetrahydroboraat(III), sulfaat en fosfaat. Bij transitiemetalen en hun complexen komen tetraëders voornamelijk voor bij elektronenconfiguraties d0 of d10. Voorbeelden zijn tetrakis(trifenylfosfine)palladium(0), nikkeltetracarbonyl en titanium(IV)chloride. 化学において、四面体形分子構造(しめんたいがたぶんしこうぞう、Tetrahedral molecular geometry)とは、中心原子に配位する4個の置換基が四面体の頂点に位置した分子の幾何配置のことである。メタンやその他ののように、4個の置換基がすべて同じときその結合角はcos−1(−1/3) = 109.4712206...° ≈ 109.5°である。この完全に対称な四面体は点群Tdに属するが、ほとんどの四面体分子はそれほど対称性は高くない。四面体分子はキラルになることができる。 Em uma geometria molecular tetraédrica, um átomo central está localizado no centro com quatro substituintes que estão localizados nos cantos de um tetraedro. Os ângulos de ligação são cos−1(−⅓) = 109.4712206...° ≈ 109.5° quando todos os quatro substituintes são iguais, como no metano (CH4), bem como em . O metano e outras moléculas tetraédricas perfeitamente simétricas pertencem ao grupo de pontos Td, mas a maioria das moléculas tetraédricas possui menor simetria. Moléculas tetraédricas podem ser quirais. البنية الجزيئية رباعية السطوح هي بنية جزيئية يكون فيها ذرة مركزية يحيط بها أربع متبادلات، تكون واقعة على زوايا رباعي سطوح. تكون الزوايا بين الروابط في هذه البنية cos−1(−1/3) ≈ 109.5°، وذلك عندما تكون المستبدلات الطرفية ذاتها، كما في غاز الميثان CH4. ينتمي رباعي السطوح ذو التناظر التام إلى الزمرة النقطية Td، ولكن في الواقع فإن أغلب الجزيئات لا يكون لها ذلك التناظر التام. La geometria molecular tetraèdrica és un tipus de geometria molecular en la qual un àtom central es troba al centre enllaçat químicament amb quatre substituents que es troben en les cantonades d'un tetraedre. Alguns exemples d'espècies químiques amb aquesta geometria són el metà (CH₄), l'ió amoni NH₄+), o els anions sulfat (SO₄2-) i fosfat (PO₄3-).
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