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関連する概念動画

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between 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,...
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...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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関連する実験動画

Updated: Jun 20, 2026

Single-Molecule F&ouml;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
11:27

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

単一分子結合の挫折した回転.

Young S Park1, Jonathan R Widawsky, Maria Kamenetska

  • 1Department of Chemistry, Columbia University, New York, New York, USA.

Journal of the American Chemical Society
|September 3, 2009
PubMed
まとめ
この要約は機械生成です。

金-カルコゲン結合の分子指向は,結合分子における電子輸送に影響を与える. 金電極,カルコゲン単体ペア,および芳香のパイシステム間の大きな重複は,分子結合伝導性を高めます.

さらに関連する動画

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
10:23

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules

Published on: April 25, 2025

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
10:59

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

Published on: August 17, 2022

関連する実験動画

Last Updated: Jun 20, 2026

Single-Molecule F&ouml;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
11:27

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
10:23

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules

Published on: April 25, 2025

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
10:59

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

Published on: August 17, 2022

科学分野:

  • 分子電子は分子電子である.
  • オーガニック・ケミストリー オーガニック・ケミストリー
  • 表面科学とは,地表科学のことである.

背景:

  • 分子結合における電荷輸送の理解は,新しい電子機器の開発に不可欠です.
  • 電子と有機分子との間のインターフェースは,デバイスの性能に大きな影響を与えます.

研究 の 目的:

  • 金-カルコゲン結合の方向性が結合分子を通しての電子輸送にどのように影響するかを調査する.
  • 分子伝導性におけるカルコゲン単体ペアと芳香型パイシステムの役割を明らかにする.

主な方法:

  • 特別に設計された分子結合の導電性測定.
  • 異なる分子構造の導電性を比較する (例えば,1,4-bis(methylthio) ベンゼンとテトラヒドロベンゾジジオフェン).

主要な成果:

  • 金-硫黄 (Au-S) と金-セレニウム (Au-Se) の結合の方向性は,アロマティック・パイ系に相対して,電子輸送を明示的に制御する.
  • 伝導経路は,黄金の電極を芳香のPIシステムに接続する,塩素の単一のペアを含む.
  • これらのコンポーネントの重複が増えると,導電性が高くなります.

結論:

  • 電極-分子インターフェイスにおける分子指向は,電荷輸送を制御する重要な要因である.
  • カルコゲン単対の相互作用と芳香系は,分子結合における効率的な電子輸送に不可欠である.
  • この研究は,高性能分子電子機器の設計のための基本的な洞察を提供します.