Multiple-Quantum Cross-Polarization and Two-Dimensional MQMAS NMR of Quadrupolar Nuclei

Sharon Elizabeth Ashbrook, Stephen Wimperis

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Cross-polarization from H-1 to the multiple-quantum coherences of a quadrupolar nucleus is used in combination with the two-dimensional multiple-quantum magic angle spinning (MQMAS) NMR experiment in order to extract high-resolution CPMAS NMR spectra. The technique is demonstrated on Na-23 (S = 3/2), O-17, Al-27 (both S = 5/2), and Sc-45 (S = 7/2) nuclei, showing the applicability of multiple-quantum cross-polarization to systems with differing spin quantum number, gyromagnetic ratio, and relative nuclide abundance. The utility of this two-dimensional MAS NMR experiment for spectral editing and site-specific measurement of crosspolarization intensities is demonstrated. The possibility of direct cross-polarization to higher order multiple-quantum coherences is also considered and three-, five-, and seven-quantum cross-polarized Sc-45 MAS NMR spectra are presented. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)238-249
Number of pages12
JournalJournal of Magnetic Resonance
Volume147
DOIs
Publication statusPublished - Dec 2000

Keywords

  • ANGLE-SPINNING NMR
  • MAS NMR
  • ALMEPO-BETA
  • MAGNETIC-RESONANCE
  • POWDER LINESHAPES
  • SOLIDS
  • AL-27
  • SPECTROSCOPY
  • PROTON
  • TRANSFORMATION

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