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Double-Quantum-Filtered Rotational-Resonance MAS NMR in the Presence of Large Chemical Shielding Anisotropies

✍ Scribed by Matthias Bechmann; Xavier Helluy; Angelika Sebald

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 200 KB
Volume: 152
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2001.2393

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✦ Synopsis

Double-quantum filtration under rotational resonance MAS

NMR conditions where the chemical shielding anisotropies involved exceed the differences in isotropic chemical shielding is considered by means of numerical simulations and 13 C MAS NMR experiments. The responses of two different pulse sequences, suitable for double-quantum filtration specifically under rotational resonance conditions, to large chemical shielding anisotropies are compared. In the presence of large chemical shielding anisotropies a very recently introduced pulse sequence (T.

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Double-quantum filtered MAS NMR spectra of an isolated homonuclear spin-1/2 pair are considered, at and away from rotational resonance conditions. The pulse sequence used is the solid-state NMR equivalent of double-quantum filtered COSY, known from solution-state NMR. The 119Sn spin pair in [(chex3S