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関連する概念動画

Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.4K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.4K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.7K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.7K
Prochirality02:05

Prochirality

4.0K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.0K
Chirality02:25

Chirality

23.1K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
23.1K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.5K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.5K
Stereoisomerism02:52

Stereoisomerism

11.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.1K

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関連する実験動画

Updated: Apr 25, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

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軸性キラルアレンニルゴールド複合体

Alice Johnson1, Antonio Laguna, M Concepción Gimeno

  • 1Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , 50009 Zaragoza, Spain.

Journal of the American Chemical Society
|August 29, 2014
PubMed
まとめ

新しいアレニルゴールド複合体は,トリフェニルプロパルギルフォスフォニウムブロミドから合成されました. この研究では,黄金に対するアレン同位体には,黄金の影響を受けた2つの異なる調整モードが明らかになりました.

科学分野:

  • 有機金属化学 有機金属化学
  • ゴールド・コンプレックス (Gold Complex) とは
  • フォスフォニウム塩の塩分

背景:

  • トリフェニルプロパルギルフォスフォニウムブロミドは,新しい有機金属化合物の前駆体として機能します.
  • 移行金属とアレンイソマーの協調化学を理解することは,新しい触媒システムの開発に不可欠です.

研究 の 目的:

  • 前例のないアレニルゴールド複合体を合成する.
  • 金の酸化状態に基づいてアルネニルゴールド複合体の調整モードを調査する.
  • 合成された複合体を構造的に特徴づける.

主な方法:

  • トリフェニルプロパルギルフォスフォニウムブロミドから始まるアルネニルゴールド複合体の合成.
  • 合成された複合体の構造的特徴化のためのX線 difraktion.
  • 異なる黄金前駆体 (ゴールド (I) とゴールド (III)) の探査を行い,協調変異を研究する.

主要な成果:

  • アルファ-炭素の調整によるブロモ-,ペンタフルオロフェニル-,トリフェニルフォスフィン-ゴールド (I) アレニル複合体の合成に成功しました.
  • カイラルペンタフローロフェニル-ゴールド (III) アレニル複合体の準備,ガンマ-炭素の調整を特徴とする.

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  • X線 difraktionにより,すべての合成複合体における特徴的なCCC単位距離が確認されました.

    • 結論:

    • アレニルゴールド複合体への新しい合成経路を確立しました.
    • アレネイソメアの調整モードが金酸化状態に依存することを示した.
    • これらのユニークなオルガン・ゴールド化合物の詳細な構造の洞察を提供しました.