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Related Concept Videos

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
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...
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...
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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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Surface enhanced NMR spectroscopy by dynamic nuclear polarization.

Anne Lesage1, Moreno Lelli, David Gajan

  • 1Centre de RMN à Très Hauts Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France.

Journal of the American Chemical Society
|September 14, 2010
PubMed
Summary

Dynamic nuclear polarization significantly boosts surface Nuclear Magnetic Resonance (NMR) spectra. This technique enhances signals from surface species by over 50-fold, aiding in material analysis.

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Area of Science:

  • Solid-state chemistry
  • Surface science
  • Nuclear Magnetic Resonance (NMR) spectroscopy

Background:

  • Surface Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for characterizing surface species.
  • Low natural abundance of certain NMR-active nuclei (e.g., carbon-13) leads to weak surface signals.
  • Enhancement techniques are needed to improve the sensitivity of surface NMR.

Purpose of the Study:

  • To investigate the effectiveness of dynamic nuclear polarization (DNP) for enhancing surface NMR signals.
  • To demonstrate signal amplification for surface species covalently bonded to silica.
  • To quantify the signal enhancement achieved using DNP.

Main Methods:

  • Application of dynamic nuclear polarization (DNP) to surface NMR experiments.
  • Transfer of polarization from solvent protons to surface-bound carbon-13 nuclei.
  • Utilizing silica frameworks with covalently incorporated surface species.

Main Results:

  • Achieved a significant enhancement of surface NMR spectra.
  • Demonstrated at least a 50-fold signal enhancement for surface species.
  • Successful polarization transfer from solvent protons to carbon-13 nuclei at the surface.

Conclusions:

  • Dynamic nuclear polarization is a powerful technique for enhancing surface NMR sensitivity.
  • DNP enables the study of surface species with low natural isotopic abundance.
  • This method significantly improves the detectability of surface species in silica frameworks.