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Related Concept Videos

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...
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.
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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

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

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...

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Hyperpolarized Xenon for NMR and MRI Applications
16:20

Hyperpolarized Xenon for NMR and MRI Applications

Published on: September 6, 2012

Progress in hyperpolarized ultrafast 2D NMR spectroscopy.

Mor Mishkovsky1, Lucio Frydman

  • 1Department of Chemical Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 14, 2008
PubMed
Summary

Hyperpolarization techniques significantly boost NMR spectroscopy sensitivity. Integrating dynamic nuclear polarization with ultrafast methods enables rapid 2D NMR acquisition for small molecules.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Hyperpolarization Techniques
  • Dynamic Nuclear Polarization (DNP)

Background:

  • Hyperpolarization methods dramatically increase nuclear spin state values beyond Boltzmann equilibrium.
  • Ex situ dynamic nuclear polarization (DNP) achieves up to 50% spin polarization in liquid samples, offering immense NMR sensitivity.
  • Conventional 2D NMR experiments are ill-suited for hyperpolarized samples due to the need for numerous identical scans.

Purpose of the Study:

  • To explore the integration of ex situ DNP with ultrafast NMR methods.
  • To assess the feasibility of acquiring 2D NMR spectra from hyperpolarized liquids.
  • To evaluate the potential of this combined approach for enhanced sensitivity and speed in NMR analysis.

Main Methods:

  • Combining ex situ dynamic nuclear polarization (DNP) with spatially encoded ultrafast NMR techniques.
  • Acquiring 2D NMR spectra (heteronuclear correlation) on hyperpolarized small molecules.
  • Comparing the performance of the integrated approach with conventional 2D NMR methods.

Main Results:

  • The integrated hyperpolarized ultrafast NMR approach enables 2D spectra acquisition on hyperpolarized liquids.
  • Heteronuclear correlation spectra can be obtained at significantly lower concentrations compared to conventional 2D NMR.
  • Equivalent overall experiment durations yield superior results for the new integrated method.

Conclusions:

  • The integration of DNP with ultrafast NMR presents a promising avenue for rapid 2D NMR acquisition.
  • This approach significantly enhances sensitivity, allowing for lower concentration analyses.
  • Further research is needed to overcome existing challenges and fully realize the potential of this advanced 2D NMR technique.