Journal of the Brazilian Chemical Society
versión impresa ISSN 0103-5053
MEDEK, Ales y FRYDMAN, Lucio. Multiple - quantum magic - angle spinning NMR: a new technique for probing quadrupolar nuclei in solids. J. Braz. Chem. Soc. [online]. 1999, vol.10, n.4, pp. 263-277. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50531999000400003.
We have recently described a new technique capable of recording high resolution NMR spectra of half - integer quadrupolar nuclei in solid samples, based on the combined use of magic - angle - spinning (MAS) and multiple - quantum (MQ) spectroscopy1. This review summarizes the basic theoretical aspects underlying this high resolution MQMAS NMR experiment, emphasizing as well practical aspects involved in the optimization of its signal - to - noise. We also describe the features of MQMAS spectral lineshapes, and exemplify these with a number of applications on various quadrupolar nuclei. Also discussed is the occurrence of unusual spinning sideband patterns along the multiple - quantum domain; additional references to ongoing progress in the area that has appeared in the recent literature are also presented.
Palabras llave : solid state NMR; quadrupolar nuclei; resolution enhancement; 2D NMR spectroscopy.