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

Intermediate motions as studied by solid-state separated local field NMR experiments. Research Abstract Details 

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Intermediate motions as studied by solid-state separated local field NMR experiments. Abstract Text:

In this report, the application of a class of separated local field NMR experiments named dipolar chemical shift correlation (DIPSHIFT) for probing motions in the intermediate regime is discussed. Simple analytical procedures based on the Anderson-Weiss (AW) 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 period), 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 poly[2-methoxy-5-(2(')-ethylhexyloxy)-1,4-phenylenevinylene], were characterized. Possible extensions are also discussed.

Intermediate motions as studied by solid-state separated local field NMR experiments. Publishing Authors By Initials

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Intermediate motions as studied by solid-state separated local field NMR experiments. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of chemical physics

VOLUME: 128

Page Numbers: 104505

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ISSN: 0021-9606

DAY: 14

MONTH: Mar

YEAR: 2008

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LANGUAGE: eng

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AFFILIATION: Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, CEP, 13560-970 São Carlos, São Paulo, BrazilInstitut für Physik, Martin-Luther-Universität Halle-Wittenberg, Friedemann-Bach-Platz 6, D-06108 Halle, Germany.

Country: United States

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MEDLINETA: J Chem Phys

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