High-resolution multiple quantum MAS NMR spectroscopy of half-integer quadrupolar nuclei

✍ Scribed by Gang Wu; David Rovnyank; Boqin Sun; Robert G. Griffin

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 500 KB
• Volume: 249
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01376-8

✦ Synopsis

We demonstrate the utility of a two-pulse sequence in obtaining high-resolution solid state NMR spectra of half-integer quadrupolar nuclei with magic-angle-spinning (MAS). The experiment, which utilizes multiple/single-quantum correlation, was first described in a different form by Frydman and Harwood [J. Am. Chem. Soc. 117 (1995) 5367] and yields high-resolution isotropic NMR spectra where shifts are determined by the sum of resonance offset (chemical shift) and second-order quadrupolar effects. The two-pulse sequence described here is shown to provide a higher and more uniform excitation of multiple-quantum coherence than the three-pulse sequence used previously.

of experiments are technically demanding and re-* Corresponding author, quire specially designed NMR probes.