{"title":"Improvements in Resolution of ¹H NMR of solids.","authors":"Bruno Simões de Almeida, Lyndon Emsley","doi":"10.2533/chimia.2023.212","DOIUrl":null,"url":null,"abstract":"<p><p>Magic angle spinning (MAS) in 1H NMR has allowed progress from featureless spectra in static samples to linewidths of a few hundreds of Hertz for powdered solids at the fastest spinning rates available today (100-150 kHz). While this is a remarkable improvement, this level of resolution is still limiting to the widespread use of 1H NMR for complex systems. This review will discuss two recent alternative strategies that have significantly improved 1H resolution, when combined with fast MAS. The first is based on anti-z-COSY, a 2D experiment originally used for J decoupling in liquids, which removes residual broadening due to splittings caused by imperfect coherent averaging of MAS. The second strategy is to obtain pure isotropic proton (PIP) spectra in solids, by parametrically mapping any residual broadening due to imperfect averaging into a second dimension of a multidimensional correlation spectrum.</p>","PeriodicalId":45745,"journal":{"name":"JOURNAL OF NEAR EASTERN STUDIES","volume":"24 1","pages":"212-216"},"PeriodicalIF":0.6000,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JOURNAL OF NEAR EASTERN STUDIES","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.2533/chimia.2023.212","RegionNum":1,"RegionCategory":"历史学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ARCHAEOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Magic angle spinning (MAS) in 1H NMR has allowed progress from featureless spectra in static samples to linewidths of a few hundreds of Hertz for powdered solids at the fastest spinning rates available today (100-150 kHz). While this is a remarkable improvement, this level of resolution is still limiting to the widespread use of 1H NMR for complex systems. This review will discuss two recent alternative strategies that have significantly improved 1H resolution, when combined with fast MAS. The first is based on anti-z-COSY, a 2D experiment originally used for J decoupling in liquids, which removes residual broadening due to splittings caused by imperfect coherent averaging of MAS. The second strategy is to obtain pure isotropic proton (PIP) spectra in solids, by parametrically mapping any residual broadening due to imperfect averaging into a second dimension of a multidimensional correlation spectrum.
期刊介绍：
Devoted to an examination of the civilizations of the Near East, the Journal of Near Eastern Studies has for 125 years published contributions from scholars of international reputation on the archaeology, art, history, languages, literatures, and religions of the Near East. Founded in 1884 as Hebraica, the journal was renamed twice over the course of the following century, each name change reflecting the growth and expansion of the fields covered by the publication. In 1895 it became the American Journal of Semitic Languages and Literatures, and in 1942 it received its present designation, the Journal of Near Eastern Studies. From an original emphasis on Old Testament studies in the nineteenth century.
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