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Related Concept Videos

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

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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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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Dynamic nuclear polarization surface enhanced NMR spectroscopy.

Aaron J Rossini1, Alexandre Zagdoun, Moreno Lelli

  • 1Centre de RMN a Tres Hauts Champs, Universite de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France.

Accounts of Chemical Research
|March 23, 2013
PubMed
Summary
This summary is machine-generated.

Dynamic nuclear polarization surface enhanced NMR spectroscopy (DNP SENS) significantly boosts sensitivity for atomic-level surface characterization of advanced materials. This technique enables faster, more detailed analysis of complex materials, overcoming limitations of traditional methods.

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Advanced material properties are often dictated by interfacial structures.
  • Characterizing material surfaces at the atomic level is crucial for development but challenging due to low sensitivity of techniques like solid-state NMR, especially for low surface area materials.
  • Dynamic nuclear polarization (DNP) is a method to enhance NMR sensitivity significantly.

Purpose of the Study:

  • To present and discuss the application of DNP to enhance surface NMR signals, termed DNP surface enhanced NMR spectroscopy (DNP SENS).
  • To introduce the incipient wetness impregnation (IWI) technique for preparing samples for DNP SENS.
  • To demonstrate the utility of DNP SENS for atomic-level characterization of advanced material surfaces.

Main Methods:

  • DNP SENS utilizes the transfer of high electron polarization from unpaired electrons to surrounding nuclei to amplify NMR signals.
  • The incipient wetness impregnation (IWI) technique is employed to introduce radical solutions onto porous and particulate materials without sample dilution.
  • Comparison of DNP SENS results with conventional room temperature NMR spectroscopy for sensitivity enhancement quantification.

Main Results:

  • DNP SENS provides sensitivity enhancements of up to 100-fold, reducing acquisition times by five orders of magnitude.
  • The IWI technique ensures uniform wetting and maintains sample concentration, facilitating effective DNP enhancement.
  • Successful application of DNP SENS for detailed characterization of mesoporous materials, nanoparticulate samples, hybrid materials, organometallic surface species, and metal-organic frameworks.

Conclusions:

  • DNP SENS significantly enhances the sensitivity of solid-state NMR for surface analysis, enabling rapid, atomic-level characterization of complex materials.
  • The IWI method is an effective and simple approach for sample preparation in DNP SENS.
  • This technique opens new possibilities for NMR applications in materials science, particularly for samples with low surface areas or active sites.