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関連する概念動画

Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

847
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
847
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

540
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
540
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

310
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
310
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.2K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.2K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.7K
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...
1.7K

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関連する実験動画

Updated: Sep 19, 2025

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

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オーバーハウザーのダイナミックな核極化を用いた固体液体界面での表面強化核磁気共振スペクトロスコーピー

Yu Rao1, Domenico Gioffrè2, Marcel Levien1

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Journal of the American Chemical Society
|June 16, 2025
PubMed
まとめ

この研究は,環境条件下で固体-液体界面の固体磁気共振 (NMR) 信号を大幅に増幅するために,交換媒介のオーバーハウザー効果ダイナミック核偏振 (OE-DNP) を使用する新しい方法を導入しています.

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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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科学分野:

  • 表面科学
  • 固体NMRスペクトロシー
  • 有機金属化学

背景:

  • 環境条件下で固体と液体の接点の固体表面を検出することは困難です.
  • 核磁共振 (NMR) 信号の強化は,表面の特徴化に不可欠です.

研究 の 目的:

  • 固体表面のNMR信号を環境温度で固体-液体インターフェイスで強化するための効率的な方法を開発する.
  • 表面と溶液の両方で,インターフェイス化学をモニタリングするための種の検出を可能にします.

主な方法:

  • 交換媒介によるオーバーハウザー効果のダイナミックな核極化 (OE-DNP) を利用する.
  • シリカを支える材料のRh (I) 表面部位におけるトリフェニルフォスフィン (PPh) リガンドのP NMR信号に適用する.
  • 表面有機金属化学による材料の調製

主要な成果:

  • 環境条件下でP信号の効率的なDNP強化を達成した.
  • 大幅な表面増強 (εsurface = 20−30) と溶液増強 (εsolution 50まで) が観察されました.
  • 表面と溶液で同時に信号の強化が実証されている.

結論:

  • 開発されたOE-DNPアプローチは,固体-液体のインターフェースでのNMR信号を効果的に強化します.
  • この方法では,表面と溶液の両方の段階で種を検出できます.
  • 表面とインターフェースの化学をリアルタイムでモニタリングするための新しい可能性を開きます.