Motional broadening: an important distinction between multiple-quantum and satellite-transition MAS NMR of quadrupolar nuclei

Autor:	Andrew J. Berry, Stephen Wimperis, Sasa Antonijevic, Sharon E. Ashbrook
Rok vydání:	2002
Předmět:	Chondrodite Clinohumite NMR spectra database Nuclear magnetic resonance Chemistry Multiple quantum Isotropy engineering General Physics and Astronomy Physical and Theoretical Chemistry engineering.material
Zdroj:	Chemical Physics Letters. 364:634-642
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(02)01412-4
Popis:	Multiple-quantum (MQ) and satellite-transition (ST) magic-angle spinning (MAS) are two very similar techniques used to obtain high-resolution or ‘isotropic’ NMR spectra of half-integer quadrupolar nuclei. In a variety of materials it is observed that some STMAS peaks are very broad compared with the corresponding MQMAS peaks, sometimes so broad that they are unobservable. We present 17 O ( I =5/2) NMR spectra of two materials, chondrodite (2Mg 2 SiO 4 · Mg(OH) 2 ) and clinohumite (4Mg 2 SiO 4 ·Mg(OH) 2 ), exhibiting this phenomenon and show that the cause is motional broadening arising from the combined effects of molecular reorientation, the quadrupolar interaction and MAS.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::095a49df484ad54fab1edcbf90112964 https://doi.org/10.1016/s0009-2614(02)01412-4 Zobrazit plný text záznamu Full Text from ScienceDirect