A Two-Dimensional NMR Experiment for the Study of Slow Motions in Complex Chemical Systems

Duer, Melinda J.

doi:10.1006/jmra.1996.0074

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…This includes the Floquet theory, 15,21 extended exchange theory, 22,23 approximate theories based on the Anderson-Weiss theory, [18][19][20] and stepwise numerical propagation 24,25 using the solution of the stochastic Liouville-von-Neumann equation. Among these approaches, full spin dynamics simulations based on density matrix propagation were chosen to be employed here for the method validation.…”

Section: Spin Dynamics Simulationsmentioning

confidence: 99%

“…Qualitatively, the incoherent exchange processes interfere with the coherent time dependence of the MAS and spoil the periodicity of the time-domain signal, leading to a characteristic line broadening. 16 Successful approaches to calculate spectra include the application of the AndersonWeiss theory, [17][18][19][20] Floquet theory, 15,21 extended exchange theory, 22,23 or stepwise numerical propagation in the framework of partial analytical solutions or of explicit density matrix simulations. 24,25 In addition, in most of the cases for natural isotopic abundance nuclei in organic solids, dipolar decoupling has to be applied in concert with MAS to achieve appreciable spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

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Intermediate motions as studied by solid-state separated local field NMR experiments

deAzevedo

Saalwächter

Pascui

et al. 2008

The Journal of Chemical Physics

126

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Second-order dipolar order in magic-angle spinning nuclear magnetic resonance J. Chem. Phys. 135, 154507 (2011) Single crystal nuclear magnetic resonance in spinning powders J. Chem. Phys. 135, 144201 (2011) Resistive detection of optically pumped nuclear polarization with spin phase transition peak at Landau level filling factor 2/3 Appl. Phys. Lett. 99, 112106 (2011) High-resolution 13C nuclear magnetic resonance evidence of phase transition of Rb,Cs-intercalated singlewalled nanotubes J. Appl. Phys. 110, 054306 (2011) Introduction of the Floquet-Magnus expansion in solid-state nuclear magnetic resonance spectroscopy J. Chem. Phys. 135, 044109 (2011) Additional information on J. Chem. Phys. In this report, the application of a class of separated local field NMR experiments named dipolar chemical shift correlation ͑DIPSHIFT͒ for probing motions in the intermediate regime is discussed. Simple analytical procedures based on the Anderson-Weiss ͑AW͒ approximation are presented. In order to establish limits of validity of the AW based formulas, a comparison with spin dynamics simulations based on the solution of the stochastic Liouville-von-Neumann equation is presented. It is shown that at short evolution times ͑less than 30% of the rotor period͒, the AW based formulas are suitable for fitting the DIPSHIFT curves and extracting kinetic parameters even in the case of jumplike motions. However, full spin dynamics simulations provide a more reliable treatment and extend the frequency range of the molecular motions accessible by DIPSHIFT experiments. As an experimental test, molecular jumps of imidazol methyl sulfonate and trimethylsulfoxonium iodide, as well as the side-chain motions in the photoluminescent polymer poly͓2-methoxy-5-͑2Ј-ethylhexyloxy͒-1,4-phenylenevinylene͔, were characterized. Possible extensions are also discussed.

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