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関連する概念動画

Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

20.0K
The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
20.0K
Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

6.9K
Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
6.9K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
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...
2.9K
Induced Electric Dipoles01:28

Induced Electric Dipoles

5.0K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
5.0K
Van der Waals Interactions01:24

Van der Waals Interactions

73.1K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
73.1K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.7K
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...
1.7K

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関連する実験動画

Updated: Mar 23, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

11.9K

現実の空間における一貫した分子間二極二極結合の可視化

Yang Zhang1, Yang Luo1, Yao Zhang1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Nature
|April 1, 2016
PubMed
まとめ

研究者はスキャニングトンネル顕微鏡を用いて,亜鉛-フタロシアニンの分子におけるエキソニン結合を視覚化しました. この技術はエネルギー伝送と光学プロセスをマッピングし,光収集システムと量子光源の設計を可能にします.

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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関連する実験動画

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Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

11.9K
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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科学分野:

  • 物理化学
  • 分子生物物理学
  • ナノ科学

背景:

  • 生物学的および人工的なシステムにおける エネルギー伝達には 刺激的結合が不可欠です
  • 従来の光学は,相関性二極結合とエクシトン移位を観察する際の difraktion limit に関して制限に直面している.
  • 効率的な光収集構造と量子光源の設計には エクシトン結合を理解することが重要です

研究 の 目的:

  • 分子系におけるエクシトン結合の空間的分布をマッピングする方法を実証する.
  • 一貫した二極二極相互作用とエクシトンの移位をリアル空間で視覚化する.
  • 光学およびエネルギー転送アプリケーションのための分子システムの合理的な設計を可能にします.

主な方法:

  • スキャントンネル顕微鏡 (STM) を使用して,電子トンネルを通じて高度に局所化された刺激を生成します.
  • 亜鉛-フタロシアニン分子の定義された配列のエキシトニン結合をマッピングするために,結果として発光した.
  • 分子軌道貢献と二極相互作用を理解するために,異なるエネルギー状態の発光パターンを分析した.

主要な成果:

  • ジンク・フタロシアニン・ディマーとオリゴマーにおけるエキストン結合の空間分布を成功裏にマッピングした.
  • 局所的な光学反応を明らかにする分子軌道に似た発光パターンを観測した.
  • 局所選択的刺激により,分子オリゴマーの超放射性が示され,過渡二極の増加に関連しています.
  • 局所光学応答が分子指向と移行二極相に依存することを示した.

結論:

  • STMベースの光成像技術は,一貫した二極二極結合に関する詳細な空間情報を提供します.
  • このアプローチは屈折の限界を克服し,エクシトニックの相互作用を空前の現実空間で可視化します.
  • この発見は 光の収集と量子技術の 分子システムの高度な工学への道を開きます