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

被引:62
作者
Ashbrook, SE
Antonijevic, S
Berry, AJ
Wimperis, S
机构
[1] Univ Exeter, Sch Chem, Exeter EX4 4QD, Devon, England
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
基金
英国工程与自然科学研究理事会; 澳大利亚研究理事会;
关键词
D O I
10.1016/S0009-2614(02)01412-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 O-17 (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. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:634 / 642
页数:9
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