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関連する概念動画

Prochirality02:05

Prochirality

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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...

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関連する実験動画

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

高度安定したキラル (A) 6-B 超分子共ポリマー:マルチバレンシーベースの自己組み立てプロセス

Shi-Gui Chen1, Yue Yu, Xin Zhao

  • 1State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China.

Journal of the American Chemical Society
|July 5, 2011
PubMed
まとめ

研究者らは,亜鉛ポルフィリンとピリジンのリンク剤を使用して,新しいキラル層の超分子共ポリマーを組み立てました. この複雑な材料形成は,組み立ての過程でダイナミック制御から熱力学的制御に移行します.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

関連する実験動画

Last Updated: May 31, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

科学分野:

  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学
  • 協調化化学について

背景:

  • 制御されたアーキテクチャを持つ高度な材料の開発は極めて重要です.
  • ヒラルの超分子構造は,様々な用途にユニークな性質を提供します.
  • 自己組み立てプロセスは,複雑な分子システムを構築する鍵です.

研究 の 目的:

  • 新型キラル層の超分子共ポリマーを合成する.
  • この新しい共ポリマーの自己組み立てメカニズムを調査するために.
  • その形成の原動力や制御メカニズムを理解する.

主な方法:

  • 水素結合C(6) -対称亜鉛ポルフィリン六合体合成.
  • クイラルC(3) -対称ピリジンヘクサデント酸リンカー合成.
  • 多価亜鉛ポルフィリン-ピリジン協調駆動組.
  • 特徴付けは,UV-VISスペクトロスコーピー,円形の二重化,静的光散乱を用いて行われました.

主要な成果:

  • 高分子量キラル層の超分子共ポリマーの組み立てに成功しました.
  • 推進力として多価亜鉛ポルフィリン-ピリジン調整の実証.
  • アセンブリ制御における動的プロセスから熱力学的プロセスへの移行の証拠.
  • 顕微鏡と分散データにより,コポリマーの形成と性質が確認されました.

結論:

  • 新しいキラル型上分子共ポリマーが成功裏に合成され,特徴づけられました.
  • 組み立てプロセスは,特定の調整相互作用によって制御され,制御メカニズムでスイッチを表示します.
  • この研究は,複雑な超分子構造の合理的な設計と制御された形成の洞察を提供します.