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Recoupled Polarization Transfer Heteronuclear 1H–13C Multiple-Quantum Correlation in Solids under Ultra-fast MAS

✍ Scribed by Kay Saalwächter; Robert Graf; Hans W. Spiess

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
91 KB
Volume
140
Category
Article
ISSN
1090-7807

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✦ Synopsis

A new approach for high-resolution solid-state heteronuclear multiple-quantum MAS NMR spectroscopy of dipolar-coupled spin-1 2 nuclei is introduced. The method is a heteronuclear chemical shift correlation technique of abundant spins, like 1 H with rare spins, like 13 C in natural abundance. High resolution is provided by ultra-fast MAS and high magnetic fields, high sensitivity being ensured by a direct polarization transfer from the abundant protons to 13 C. In a rotor-synchronized variant, the method can be used to probe heteronuclear through-space proximities, while the heteronuclear dipolar coupling constant can quantitatively be determined by measuring multiple-quantum spinning-sideband patterns. By means of recoupling, even weak heteronuclear dipolar interactions are accessible. The capabilities of the technique are demonstrated by measurements on crystalline L-tyrosine hydrochloride salt.

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