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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

1.2K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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...
2.3K
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...
1.8K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.4K
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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Broadband solid-state MAS NMR of paramagnetic systems.

Andrew J Pell1, Guido Pintacuda1

  • 1Centre de RMN à Très Hauts Champs, Université de Lyon, Institute of Analytical Sciences UMR 5280 (CNRS/CNRS, Ecole Normale Supérieure de Lyon/Lyon, Université Claude Bernard Lyon 1), 5 rue de la Doua, 69100 Villeurbanne, France.

Progress in Nuclear Magnetic Resonance Spectroscopy
|February 12, 2015
PubMed
Summary

New solid-state NMR pulse sequences improve the study of paramagnetic materials by overcoming spectral broadening and signal loss. These advanced techniques are crucial for obtaining high-resolution data from complex systems.

Keywords:
Adiabatic pulseBroadbandMagic-angle spinningParamagneticSolid-state NMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Materials science and biomolecular analysis.
  • Paramagnetic systems and spin dynamics.

Background:

  • Solid-state NMR spectroscopy is increasingly applied to paramagnetic materials and biomolecules, offering crucial structural and electronic insights.
  • Magic-angle spinning (MAS) is vital for high-resolution NMR of complex systems.
  • Paramagnetic interactions cause spectral broadening and signal decay, hindering analysis.

Purpose of the Study:

  • To review and describe recently developed broadband NMR pulse sequences for paramagnetic systems under MAS.
  • To define 'broadband' conditions for spinning samples and outline ideal pulse scheme characteristics.
  • To provide a unified description of spin dynamics under MAS to guide future research.

Main Methods:

  • Review of novel broadband excitation, inversion, and refocussing pulse sequences for paramagnetic systems.
  • Analysis of spin dynamics under MAS, considering the modulation of anisotropic shift interactions.
  • Evaluation of pulse schemes using simulations and experimental data from LiFe(0.5)Mn(0.5)PO(4).

Main Results:

  • Development of new broadband NMR sequences significantly enhances the ability to study paramagnetic systems.
  • Understanding the interplay between MAS and pulse sequence efficiency is critical for optimizing spectral acquisition.
  • The reviewed sequences and spin dynamics framework are validated on a complex battery material.

Conclusions:

  • Advanced broadband NMR pulse sequences are essential for overcoming challenges in studying paramagnetic materials and biomolecules.
  • The described spin dynamics provide a valuable guide for selecting and developing NMR strategies for complex systems.
  • These advancements enable previously unobtainable NMR studies, facilitating deeper structural and electronic characterization.