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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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...
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Chirality in Nature02:30

Chirality in Nature

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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.
17.4K
Chirality02:25

Chirality

30.6K
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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...
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Prochirality02:05

Prochirality

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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...
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Updated: Feb 28, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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量子ドットアセンブリにおける電子移転のキラリティ制御

Brian P Bloom1, Brittney M Graff1, Supriya Ghosh1

  • 1Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.

Journal of the American Chemical Society
|June 14, 2017
PubMed
まとめ

分子キラリティは,量子ドット (QD) 間の電子転送速度に大きく影響します. この研究は,光の極化とQDキラリティの両方が電子伝送運動に影響を与え,電荷の流れに対する新しい制御を提供することを明らかにしています.

さらに関連する動画

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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関連する実験動画

Last Updated: Feb 28, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

9.6K
Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

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A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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科学分野:

  • 分子電子
  • 量子ドットアセンブリ
  • チラリティ指向のチャージ輸送

背景:

  • 電子スピンと分子キラリティは,ナノスケールでの電荷の流れを制御するための重要な要因です.
  • 量子ドット (QD) は,電荷移転現象を研究するための多用途のプラットフォームを提供します.

研究 の 目的:

  • 量子ドット間の電子伝送率に対する分子キラリティの影響を調査する.
  • 電子移転運動における光極化とQDキラリティの役割を調査する.

主な方法:

  • クイラル量子ドット・アセンブリの製造
  • 電子ドナーを円形の偏光で刺激する.
  • 量子ドット間の電子伝送速度を測定する
  • QDの円形二重化 (CD) スペクトルの分析.

主要な成果:

  • 分子キラリティは,QDアセンブリにおける電子伝送率に大きさの順位の影響を誘導する.
  • 刺激光の偏振と受容体QDのキラリティの両方が電子移転運動を調節する.
  • 電子移転速度の定数に対する極化が定義され,受容体QD CDのスペクトル強度と相関した.

結論:

  • QDエクシトントランジションの円形二極化 (CD) 力は,スピン依存の電子移転を予測することができる.
  • 量子ドットのキラルインプリントは,スピン依存の電子移転の基本的なメカニズムである可能性が高い.
  • これらの発見は,制御された電荷輸送のためのキラル分子システムを設計するための道を開きます.