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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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 axis.

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関連する実験動画

Updated: Jun 25, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

最適な制御によって固体NMR二極再結合の改善

Cindie T Kehlet1, Astrid C Sivertsen, Morten Bjerring

  • 1Interdisciplinary Nanoscience Center (iNANO) and Laboratory for Biomolecular NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.

Journal of the American Chemical Society
|August 19, 2004
PubMed
まとめ
この要約は機械生成です。

この研究は,固体状態の核磁気共振 (NMR) 実験のための最適な制御理論を紹介しています. これらの新しい方法により,実験効率と信頼性が向上し,グリシンサンプルにおける一貫性移転の53%の獲得を達成しました.

さらに関連する動画

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)
10:28

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)

Published on: November 2, 2018

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy
09:32

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy

Published on: January 30, 2019

関連する実験動画

Last Updated: Jun 25, 2026

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)
10:28

Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)

Published on: November 2, 2018

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy
09:32

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy

Published on: January 30, 2019

科学分野:

  • 固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーは,固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体核磁共振 (NMR) の固体磁共振 (NMR)
  • 量子制御理論とは
  • バイオ物理化学 バイオ物理化学

背景:

  • 固体NMRは,分子構造の決定に不可欠です.
  • クロス・ポラライゼーション (CP) などの既存の技術は,効率と強度において限界があります.
  • ラジオ周波数不均一性などの器具の不完全性は,実験の性能を低下させる可能性があります.

研究 の 目的:

  • 最適な制御理論を利用した新しい固体NMR実験を開発する.
  • 実験効率を高め,機器の不完全さに対する頑丈性を導入する.
  • 新しい方法の実用的な適用性と性能の向上を実証する.

主な方法:

  • 固体NMRパルス配列の設計に最適制御理論の適用.
  • マジック・アングル・スピニング (MAS) NMRにおけるヘテロ核二極再結合に焦点を当てます.
  • 数値シミュレーションによる検証と,グリシンサンプルでの実験的検証.

主要な成果:

  • 実験効率の有意な改善が示されました.
  • ラジオ周波数における均一性に対する強化された強度が達成されました.
  • 標準のダブルCP実験と比較して,15Nから13Calphaのコヒーレンス転送効率の53%の上昇が観察されました.

結論:

  • 最適制御理論は,固体NMRの進歩のための強力な枠組みを提供します.
  • 開発された実験は,従来の方法よりも優れたパフォーマンスを提供します.
  • このアプローチは,複雑なシステムにおけるより効率的で信頼性の高い構造分析の可能性を秘めています.