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Related Concept Videos

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

Two-Dimensional (2D) NMR: Overview

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

2D NMR: Overview of Homonuclear Correlation Techniques

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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...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.6K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

909
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...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.5K
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...
2.5K
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

2.2K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Multidimensional NMR spectroscopy in a single scan.

Maayan Gal1, Lucio Frydman2

  • 1Migal Galilee Institute of Research Ltd, 11016, Kiryat Shmona, Israel.

Magnetic Resonance in Chemistry : MRC
|August 8, 2015
PubMed
Summary
This summary is machine-generated.

Ultrafast Nuclear Magnetic Resonance (NMR) spectroscopy accelerates data acquisition by manipulating spins in space and time. This technique enables rapid collection of multidimensional NMR data, overcoming limitations of conventional methods.

Keywords:
Multidimensional NMRUltrafast NMRsingle-scan acquisitionsspatiotemporal encoding

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Area of Science:

  • Spectroscopic techniques
  • Biophysical chemistry
  • Organic chemistry

Background:

  • Multidimensional NMR is crucial for studying molecular structure and function.
  • Conventional NMR experiments require long acquisition times, limiting their application.
  • Developing faster NMR methods is essential for broader accessibility and efficiency.

Purpose of the Study:

  • To review the principles of ultrafast (UF) NMR.
  • To discuss methodological extensions of UF NMR.
  • To highlight the advantages of UF NMR for molecular studies.

Main Methods:

  • Spatiotemporal manipulation of nuclear spins to encode spectral information.
  • Utilizing gradient-based pulses for signal readout.
  • Acquiring multidimensional NMR correlations in a single transient.

Main Results:

  • UF NMR allows arbitrary multidimensional correlations in sub-second acquisition times.
  • Spatiotemporal spin manipulation imprints chemical shift and J-coupling evolutions into spatial patterns.
  • Gradient-based manipulations enable efficient data readout, generating conventional-like spectra.

Conclusions:

  • UF NMR offers a significant speed improvement over traditional multidimensional NMR.
  • The technique relies on innovative spatiotemporal spin manipulation principles.
  • Methodological advancements continue to expand the utility of UF NMR spectroscopy.