Satellite-transition MAS NMR of low-gamma nuclei at natural abundance: Sensitivity, practical implementation, and application to 39K (I=3/2) and 25Mg (I=5/2)

Dowell, N.G., Ashbrook, S.E. and Wimperis, S. (2004) Satellite-transition MAS NMR of low-gamma nuclei at natural abundance: Sensitivity, practical implementation, and application to 39K (I=3/2) and 25Mg (I=5/2). Journal of Physical Chemistry B, 108(35), pp. 13292-13299. (doi: 10.1021/jp047868m)

Abstract

Satellite-transition magic angle spinning (STMAS) is a recently introduced technique for recording high-resolution NMR spectra of quadrupolar nuclei in solids. We present numerical calculations of STMAS signal intensity as a function of radio frequency field strength (ν1) and spinning rate (νR) and show that the sensitivity advantage of STMAS over the older multiple-quantum technique (MQMAS) is greatest for low ν1 field strengths and high νR rates, making STMAS particularly suitable for the study of low-γ nuclei. The practical implementation of STMAS in NMR of low-γ nuclei is discussed and several experimental examples of high-resolution 39K (I = 3/2) and 25Mg (I = 5/2) NMR spectra are presented, including 25Mg spectra of brucite (Mg(OH)2), diopside (CaMgSi2O6), and talc (Mg3Si4O10(OH)2) recorded at the natural 25Mg abundance of 10%.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Wimperis, Professor Stephen
• Authors: Dowell, N.G., Ashbrook, S.E., and Wimperis, S.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Journal of Physical Chemistry B
• ISSN: 1520-6106
• Published Online: 10 August 2004