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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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.
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
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...
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...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...

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Updated: Jul 3, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

単一のNMR実験からの分子構造.

Eriks Kupce1, Ray Freeman

  • 1Varian Limited, 6 Mead Road, Yarnton, Oxford, OX5 1QU, UK.

Journal of the American Chemical Society
|July 23, 2008
PubMed
まとめ
この要約は機械生成です。

この研究は,小分子構造を効率的に決定するための新しいNMR方法を提示しています. それは複数のNMR実験を単一のパスに組み合わせ,構造分析を簡素化します.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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The Identification of Sea Lamprey Pheromones Using Bioassay-Guided Fractionation
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The Identification of Sea Lamprey Pheromones Using Bioassay-Guided Fractionation

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関連する実験動画

Last Updated: Jul 3, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

The Identification of Sea Lamprey Pheromones Using Bioassay-Guided Fractionation
09:35

The Identification of Sea Lamprey Pheromones Using Bioassay-Guided Fractionation

Published on: July 17, 2018

科学分野:

  • 有機化学 オーガニック・ケミストリー
  • アナリティカル・ケミストリー (Analytical Chemistry) とは
  • スペクトロスコーピーは,スペクトロスコーピーを用います.

背景:

  • 核磁共振 (NMR) スペクトロスコピーは,分子構造の決定に不可欠です.
  • 伝統的なNMR方法は,多くの場合,複数の実験を必要とし,時間とリソースの要求を増加させます.
  • 効率的かつ包括的な構造解明は,小分子分析における重要な課題であり続けています.

研究 の 目的:

  • 素早い小分子構造決定のための合理化されたNMR手順を開発する.
  • 基本的な構造情報の取得を単一のNMR実験に統合する.
  • NMRベースの構造分析の効率を高めるために.

主な方法:

  • 複数の標準的なNMR配列を組み合わせた単一のNMR実験.
  • 2Dの炭素-13,炭素-13の相関関係 (不十分),炭素-13の水素-1の相関関係 (単一および複数結合),および従来の炭素-13のスペクトルの並行取得.
  • 炭素13と水素1の信号を取得するために,別々の受信チャネルを使用します.
  • 炭素13検出に最適化された高感度冷凍探査機を使用しています.
  • 3つの並列受信機を使用して,自然に豊富に存在する窒素-15スペクトルを含むように配列の拡張.

主要な成果:

  • 単一のNMRパスで重要な構造情報の取得を成功させる.
  • 様々なNMR実験のための並列データ収集の実証.
  • 自然に豊富に存在する炭素13の炭素13相関の高感度検出.
  • 統合された実験に窒素-15のスペクトルデータを組み込む可能性.

結論:

  • 開発されたものは,開発されたものです.
  • オールインワンです.
  • NMR手順は,小分子構造の決定の効率を大幅に高めます.
  • この統合的アプローチは,単一の実験から包括的な構造データを提供し,時間とリソースを節約します.
  • この方法は,窒素15のような他の原子核を含むために適応可能であり,その適用範囲をさらに拡大します.