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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)

1.1K
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...
1.1K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

960
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
960
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

751
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
751

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関連する実験動画

Updated: Jul 23, 2025

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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シングレット-トリプレット変換のスピン-バイブロニックコヒーレンスドライブ

Shahnawaz R Rather1, Nicholas P Weingartz1,2, Sarah Kromer3

  • 1Department of Chemistry, Northwestern University, Evanston, IL, USA.

Nature
|July 19, 2023
PubMed
まとめ

研究者はコヒーレンス光譜を用いて,プラチナ複合体のスピン振動機構を観察した. これは,分子振動がスピン変換を制御し,興奮状態の特性の新しい設計を可能にすることを明らかにします.

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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関連する実験動画

Last Updated: Jul 23, 2025

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

9.2K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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科学分野:

  • 分子化学と材料化学
  • 量子力学
  • スペクトロスコーピー

背景:

  • 異なるスピン倍数を持つ電子状態の間の移行を制御することは化学において極めて重要です.
  • スピン-ビブロニック効果は, スピン-軌道とビブロニックカップリングの組み合わせで, 禁止された移行を加速することができます.
  • スピン振動メカニズムの実験的識別は困難でした.

研究 の 目的:

  • シングレット-トリプレート変換におけるスピン,電子,振動の相互作用を実験的に明らかにする.
  • 二核のPt (II) 複合体におけるスピン-振動的メカニズムを調査する.
  • スピン変換過程の探査機としてビブロニックコヘレンスの使用を実証する.

主な方法:

  • 4つの関係する二核型Pt (II) MMLCT複合体でコヘランススペクトロスコーピーの実験を行った.
  • 光刺激は,Pt-Pt結合形成を誘導し,振動波パケットを起動するために使用されました.
  • 波パケットのデコエレンスと再コエレンスダイナミクスは,スピン-ビブロニックメカニズムを解明するために分析されました.

主要な成果:

  • この研究は,シングレット-トリプレット変換を駆動するスピン-ビブロニックメカニズムの正確な実験的表れを特定しました.
  • Pt-Ptの伸縮座標に沿ったベクトル運動は,円の交差点に向かってエネルギーギャップを調整することが判明した.
  • この動きによって 最下位の安定した三重体の形成が進みます

結論:

  • 振動的コヘランスは,スピン変換のダイナミクスを解明する効果的な探査機として役立つ.
  • 発見は,スピン変換経路に対する分子構造依存制御を示しています.
  • この研究は,刺激状態の特性を合わせた新しい材料を設計するための洞察を提供します.