2H double-quantum MAS NMR spectroscopy as a probe of dynamics on the microsecond timescale in solids
2H double-quantum MAS NMR spectroscopy as a probe of dynamics on the microsecond timescale in solids
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DOI：
10.1016/j.cplett.2006.03.065
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发表时间：
2006-06-01
影响因子：
2.8
通讯作者：
Wimperis, Stephen
中科院分区：
文献类型：
--
作者：
Cutajar, Marica;Ashbrook, Sharon E.;Wimperis, Stephen
在自旋I = 1H-2的核的魔角自旋（MAS）NMR谱中观察到的边带可能非常强烈的加宽，如果运动存在于固体中。增宽是由于MAS的线窄化效应和H-2四极张量的动力学驱动的重取向之间的干扰引起的。在这里，我们表明，这种运动加宽是不存在的或大大减少在相应的双量子MAS NMR谱。这一观察结果提出了一种新的方法来研究固体中的动力学，并从草酸二水合物，连四硫酸钠二水合物和合成聚合物PMMA的H-2 MAS NMR中提取实例。(c)2006 Elsevier B. V.保留所有权利。
The sidebands observed in the magic angle spinning (MAS) NMR spectrum of a spin I = 1 H-2 nucleus may be very strongly broadened if motion is present in the solid. The broadening arises from interference between the line-narrowing effects of MAS and the dynamics-driven reorientation of the H-2 quadrupole tensor. Here, we show that this motional broadening is absent or much reduced in the corresponding double-quantum MAS NMR spectrum. This observation suggests a new approach to studying dynamics in solids and examples are drawn from H-2 MAS NMR of oxalic acid dihydrate, sodium tetrathionate dihydrate, and the synthetic polymer PMMA. (c) 2006 Elsevier B.V. All rights reserved.