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関連する概念動画

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
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

858
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
858
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

300
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
300
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.3K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.3K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

907
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
907

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Updated: Sep 9, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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連続波 (CW) フォトCIDNP NMRスペクトル:チュートリアル

Lars T Kuhn1, Míriam Pérez-Trujillo2

  • 1Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Freiburg i. Br., Germany.

Magnetic resonance in chemistry : MRC
|September 5, 2025
PubMed
まとめ

光化学的に誘発されたダイナミックな核極化 (光CIDNP) は,放射性反応と生物分子の研究のためのNMR感性を高めます. このチュートリアルでは,1D フォトCIDNP NMR 実験の実行について,実践的なセットアップと分析のアドバイスをユーザーに提供します.

キーワード:
NMR についてハイパーポーライゼーションインサイトスペクトロスコーピー写真化学写真-CIDNP

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15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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科学分野:

  • 磁気共鳴スペクトル
  • 物理化学
  • 生物物理化学

背景:

  • 光化学的に誘発されたダイナミックな核極化 (Photo-CIDNP) は,核のスピン選択現象である.
  • 根性反応のメカニズム的研究や バイオ分子相互作用の探査に使用される.
  • 最近の進歩とベンチトップのNMRは,敏感なハイパーポラライゼーション方法としてのフォトCIDNPへの関心を再生しました.

研究 の 目的:

  • 1Dプロトン (1H) とヘテロ核光CIDNP NMR実験の実施に関する非専門家のための実践的指針を提供すること.
  • 光源,カップリング,光敏感剤の選択を含む実験セットアップを詳細に説明します.
  • フォトCIDNPのデータ取得,分析,サンプル準備について説明します.

主な方法:

  • 高フィールドNMRスペクトロメーターと連続波 (CW) 照明の使用
  • 適切な1D 1Hと異核CIDNPパルススキームの記述
  • 写真CIDNP特有の取得パラメータと光源のトリガーに関する説明.

主要な成果:

  • 適切な実験セットアップを選択するための戦略が提示されています.
  • フォトCIDNPのサンプル準備に関する実用的なアドバイスが提供されています.
  • 1DフォトCIDNPデータの有意義な取得と分析に関するガイドラインが与えられています.

結論:

  • フォトCIDNPは,多用途で非常に敏感なNMRハイパーポラライゼーション技術として成熟しました.
  • このチュートリアルでは,1DフォトCIDNP NMRを実装するための知識を提供します.
  • この方法は,化学と生物学における多様な応用のために感度が向上します.