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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Solid-state NMR spectroscopy of quadrupolar nuclei in inorganic chemistry
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Solid-state NMR spectroscopy of quadrupolar nuclei in inorganic chemistry

机译：无机化学中四极核的固态NMR光谱

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摘要

We here review the principles and applications of solid-state NMR spectroscopy of quadrupolar nuclei, with a special emphasis on structural studies of inorganic solids. Most NMR-observable nuclei have spin I > 1/2, and possess a quadrupole moment. The resulting quadrupolar interaction severely broadens the resonances, but also encapsulates valuable information about the symmetry of the electronic surroundings of the observed nucleus. The effect of the quadrupolar interaction, as well as that of the chemical shift and dipolar interaction, on solid-state NMR spectra is examined in this article. To regain good resolution, specifically designed NMR techniques exist to remove the quadrupolar broadening, i.e. overtone and MQMAS spectroscopy, the principles of which are outlined here. In addition, the possibility of distance measurements via the dipolar interaction using the REDOR technique is discussed. The combined information derived from distance measurements, quadrupolar and chemical shift parameters can be helpful for determination of the crystal structure, or for detection of impurity phases, as illustrated by surveying a number of case studies covering spin I = 1, 3/2, 5/2 and 7/2.
机译：我们在这里回顾了四极核的固态NMR光谱学的原理和应用，特别着重于无机固体的结构研究。大多数NMR可观察到的核的自旋I> 1/2，并具有四极矩。产生的四极相互作用极大地拓宽了共振，但同时也封装了有关观察到的原子核电子环境对称性的有价值的信息。本文研究了四极相互作用以及化学位移和偶极相互作用对固态NMR光谱的影响。为了恢复良好的分辨率，存在专门设计的NMR技术来消除四极加宽，即泛音和MQMAS光谱，此处概述其原理。此外，还讨论了使用REDOR技术通过偶极相互作用进行距离测量的可能性。从距离测量，四极和化学位移参数得出的组合信息可以帮助确定晶体结构或检测杂质相，如通过调查许多涉及自旋I = 1、3 / 2、5的案例研究所说明的那样/ 2和7/2。

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