Reference EntryDOI
Quadrupolar Nuclei in Solid‐State Nuclear Magnetic Resonance
TLDR
In this paper, the line shape for first and second-order quadrupole broadened spectra with and without magic-angle spinning (MAS) of the powder, the most important experimental techniques for the study of quadrupolar nuclei with half-integer spins such as DOR, dynamic-angles spinning (DAS), MQMAS, echo and nutation techniques, and some recent developments in deuterium NMR.Abstract:
Solid-state nuclear magnetic resonance (NMR) spectroscopy is mostly applied to 1H or 13C nuclei with the nuclear spin , but about 100 of 130 NMR isotopes have , and the electric quadrupole interaction strongly broadens the NMR signal in the solid-state powder spectra. The perturbing effect of the electric quadrupole interaction is reduced at the higher magnetic fields which are available at present. In addition, approaches of the solid-state NMR traditionally used in the study of spin- nuclei have been adapted for use with quadrupolar nuclei, and some techniques, e.g. double-rotation (DOR) and multiple-quantum transition in combination with fast spinning [multiple-quantum magic-angle spinning (MQMAS)], were recently developed for quadrupolar nuclei with half-integer spins.
This article describes the basic theory, the line shape for first- and second-order quadrupole broadened spectra with and without magic-angle spinning (MAS) of the powder, the most important experimental techniques for the study of quadrupolar nuclei with half-integer spins such as DOR, dynamic-angle spinning (DAS), MQMAS, echo and nutation techniques, and some recent developments in deuterium NMR. Electric field gradient and chemical shift data for the most commonly studied quadrupolar nuclei with half-integer spins, 27Al, 23Na, and 17O, and a few references to recent solid-state NMR studies of some other quadrupolar nuclei are given.read more
Citations
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Journal ArticleDOI
Elementary Theory of Angular Momentum. By M. E. Rose. Pp. x, 248. 80s. 1957. (Wiley)
Journal ArticleDOI
Solid-State NMR Spectroscopy
Cecil Dybowski,Shi Bai +1 more
TL;DR: The present chapter demonstrates the fundamentals, various techniques, and most important applications of solid-state NMR spectroscopy making this method to an important tool of research in zeolite science.
Journal ArticleDOI
Sensitivity enhancement of NMR spectra of half-integer spin quadrupolar nuclei in solids using hyperbolic secant pulses.
TL;DR: The experimental factors influencing the enhancements achievable for the central NMR transition of spin-3/2 and spin-5/2 nuclei in the solid state using hyperbolic secant, HS, pulses for population transfer are investigated and found that the spinning frequency, the bandwidth and the frequency offset of the HS pulse play a crucial role in determining the maximum enhancements.
Journal ArticleDOI
Adsorbate Effect on AlO4(OH)2 Centers in the Metal-Organic Framework MIL-53 Investigated by Solid-State NMR Spectroscopy
TL;DR: In this paper, the effect of water molecules, nitrogen bases, and o-xylene on the hydroxyl protons of bridging AlOH groups and framework aluminum was investigated.
Book ChapterDOI
Progress in multiple-quantum magic-angle spinning NMR spectroscopy.
TL;DR: A range of very useful related techniques are available and have been reviewed, in particular satellite transition (ST) MAS, Inverse-STMAS NMR, fast amplitude modulation, and techniques based on the dipolar interactions between quadrupolar and spin-1/2 nuclei.
References
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Journal ArticleDOI
Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments
H. Y. Carr,Edward M. Purcell +1 more
TL;DR: In this paper, the effect of diffusion on free precession in nuclear resonance has been studied, and a new scheme for measuring the transverse relaxation time is described, which largely circumvents the diffusion effect.
Journal ArticleDOI
Modified Spin‐Echo Method for Measuring Nuclear Relaxation Times
S. Meiboom,D. Gill +1 more
TL;DR: In this article, a spin echo method adapted to the measurement of long nuclear relaxation times (T2) in liquids is described, and the pulse sequence is identical to the one proposed by Carr and Purcell, but the rf of the successive pulses is coherent, and a phase shift of 90° is introduced in the first pulse.
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TL;DR: In this paper, the dynamics of nuclear spin systems were studied by two-dimensional exchange spectroscopy and nuclear magnetic resonance imaging (NEMI) imaging, and two different correlation methods based on coherence transfer were proposed.
Journal ArticleDOI
Relaxation Effects in Nuclear Magnetic Resonance Absorption
TL;DR: In this article, the authors studied the effect of the thermal motion of the magnetic nuclei upon the spin-spin interaction in a rigid lattice and the line width of the absorption line.
Book
Principles of magnetic resonance
TL;DR: In this article, the effect of changing the precession frequency of the magnetic field has been studied using NMR to study rate properties. But the effect is limited to the case of double and double resonance.
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