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関連する概念動画

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

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関連する実験動画

Updated: Jun 24, 2026

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
06:48

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

非局所的な相互作用を通して螺旋転移する.

Xiaojian Wu1, Sunjun Ji, Yi Li

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.

Journal of the American Chemical Society
|April 8, 2009
PubMed
まとめ

チラルのボラ型エナチオメアは,水の中で物理的ゲルを形成し,螺旋状のシリカナノ構造物のテンプレート合成を可能にします. この方法は,高度な材料のメソポラスシリカ構造とヘリシティを制御します.

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
  • ナノテクノロジー ナノテクノロジー

背景:

  • チラルボラ型アンフィフィフィルは,秩序ある構造に自己組み立てることができる.
  • 自己組み立て構造は,ナノ材料合成のテンプレートとして機能することができます.

研究 の 目的:

  • キラルボラ型エナティオメールを合成し,その自己組み立てをテンプレートとして利用し,制御されたヘリシティを持つメソポラスシリカナノ構造を作成します.
  • テンプレッティングプロセスと,その結果生じるシリカ構造に対する酸性および塩基性の条件の影響を調査する.

主な方法:

  • キラルボラ型エナチオマー (ll-12PyBrとdd-12PyBr) の合成.
  • テンプレートとしてアンフィフィール自己組み立てを使用したソルゲルトランスクリプション.
  • 粉末X線 difraktionを用いたシリカナノ構造の特徴化.

主要な成果:

  • 左利きと右利きの螺旋状の1,4-フェニレン-シリカ束は,特定のエナティオマーをテンプレートとして使用して,酸性条件下で成功裏に準備されました.
  • 1,4-フェニレン-シリカの束は,基本的な条件下で得られ,高次の順序は,孔壁内の芳香指輪の詰め込みで観察されました.
  • 螺旋状のシリカ,1,3-フェニレン-シリカ,エーテン-シリカ,エータン-シリカのバンドルもキラルテンプレートを使用して合成されました.

さらに関連する動画

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features
07:09

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features

Published on: March 16, 2022

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins
05:08

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins

Published on: July 8, 2025

関連する実験動画

Last Updated: Jun 24, 2026

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
06:48

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features
07:09

Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features

Published on: March 16, 2022

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins
05:08

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins

Published on: July 8, 2025

結論:

  • チラルボラ型アンフィフィール自己組み立ては,シリカナノ構造のヘリシティとメソポラス構造を制御するための効果的なテンプレートです.
  • pH条件は,テンプレートされたシリカ材料の順番,そして潜在的にハンドル性に大きく影響します.
  • このテンプレート製のアプローチは,キラル分離と触媒の潜在的応用を持つ様々な螺旋状シリカアーキテクチャを製造するための多用途な経路を提供します.