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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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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...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Selective spin inversion in solution by magic field cross polarization.

Joel R Tolman1, Luke W Arbogast2

  • 1Johns Hopkins University, Department of Chemistry, 3400 N. Charles St., Baltimore, MD 21218, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 28, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel pulsed element for nuclear magnetic resonance (NMR) spectroscopy. It enables the selective inversion of a single proton (1H) nucleus, even among similar nuclei, using cross-polarization techniques.

Keywords:
Cross polarizationSolution stateSpin inversion

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Control in Magnetic Resonance

Background:

  • Selective manipulation of nuclear spins is crucial in NMR for complex spectral analysis.
  • Existing methods often struggle with differentiating degenerate nuclei (nuclei with similar resonance frequencies).

Purpose of the Study:

  • To propose and theoretically validate a new pulsed element for selective single 1H nucleus inversion.
  • To achieve this selectivity irrespective of other coupled 1H nuclei, leveraging heteronuclear coupling.

Main Methods:

  • Development of a pulsed element based on selective cross-polarization.
  • Application of matched weak radiofrequency (RF) fields on-resonance to targeted 1H-X spin pairs.
  • Theoretical analysis of coherence transfer under specific RF field amplitudes (magic field conditions).

Main Results:

  • Demonstration of selective spin inversion, inverting all 1H spins except the targeted one.
  • Theoretical prediction of transverse coherence transfer in addition to longitudinal transfer at magic field.
  • Construction of a pulsed element with 2D frequency selectivity, analogous to a BIRDr,X element.

Conclusions:

  • The proposed pulsed element offers precise control over individual 1H nuclei in NMR.
  • This technique enhances spectral resolution and analytical capabilities in heteronuclear correlation spectroscopy.
  • The method provides a powerful tool for selective spin manipulation in complex molecular systems.