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関連する概念動画

Chirality02:25

Chirality

23.4K
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...
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.6K
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...
11.6K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.5K
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...
5.5K
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
Chirality in Nature02:30

Chirality in Nature

13.5K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
13.5K
Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

3.6K
Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
3.6K

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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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クラスタリング後のダイナミック・コヴァレンント・モディフィケーションで,キラリティの制御とキラルセンシングを行う.

Yang Yang1, Xiao-Li Pei, Quan-Ming Wang

  • 1State Key Lab of Physical Chemistry of Solid Surfaces Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian, People' s Republic of China.

Journal of the American Chemical Society
|October 2, 2013
PubMed
まとめ

研究者は,金銀のクラスターを使用して機能的な材料を作成するための新しい方法を開発しました. このポストクラスタリング修正 (PCM) 戦略は,高度な材料におけるキラル認識とプロパティチューニングを可能にします.

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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A Micropatterning Assay for Measuring Cell Chirality
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関連する実験動画

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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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A Micropatterning Assay for Measuring Cell Chirality
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科学分野:

  • 無機化学 無機化学とは
  • マテリアルサイエンス 材料科学
  • 超分子化学 超分子化学

背景:

  • クラスターベースの機能的材料は,調節可能な構造と特性を提供します.
  • ポストクラスタリング・モディフィケーション (PCM) は,クラスタ機能群モディフィケーションを通じてプロパティの調整を可能にします.

研究 の 目的:

  • 新規の金銀クラスタを合成し,クラスタ化後の改変のための反応部位を備えた.
  • キラルモノアミンから金銀群へのキラル性移転を達成するために.
  • これらのキラルクラスターをキラル認識とエナティオメア過剰 (ee) 決定における応用を探求する.

主な方法:

  • 保護-脱保護戦略を用いてアルデヒドで機能化された金銀クラスタの合成.
  • クイラルモノアミンとのダイナミックな共性イミン結合形成によるポストクラスタリング変異 (PCM).
  • ホモキラリティの確認は,X線構造決定と円形二重化 (CD) スペクトロスコーピーを用いた.

主要な成果:

  • 6つの反応性アルデヒド部位を持つ新しい金銀群が成功裏に合成されました.
  • チラリティは,キラルモノアミンから金銀のクラスターに効果的に転送され,ホモキラルクラスターを形成しました.
  • 強烈なCD信号が観察され,キラル認識とee値の決定の可能性が示されました.

結論:

  • クラスターのプレファンクショナライゼーションとPCM戦略は,機能的なクラスター材料の設計に多岐にわたるアプローチを提供します.
  • この方法は,キラルセンシングにおける特性と応用に合わせた高度な材料を作成するための新しい道を開きます.