Spectral editing in C-13 solid-state NMR at high magnetic field using fast MAS and spin-echo dephasing

TitleSpectral editing in C-13 solid-state NMR at high magnetic field using fast MAS and spin-echo dephasing
Publication TypeJournal Article
Year of Publication2012
AuthorsMao KM, Kennedy GJ, Althaus SM, Pruski M
Journal TitleSolid State Nuclear Magnetic Resonance
Volume47-48
Pages19-22
Date Published10
Type of ArticleArticle
ISBN Number0926-2040
Accession NumberWOS:000310650600003
Keywordsargonne premium coals, Aromatic carbon, aromaticity, cross polarization, fast mas, H-1, khz, resolution, RESONANCE, selection, solid-state nmr, Spectral editing, spectroscopy, Spin-echo dephasing
Abstract

A simple method is proposed for separating NMR resonances from protonated and non-protonated aromatic carbons in solids under fast magic angle spinning (MAS). The approach uses a MAS-synchronized spin-echo to exploit the differences in rotational recoupling of the dipolar interactions while fully refocusing the isotropic chemical shifts. This strategy extends the relevant time scale of spin evolution to milliseconds and circumvents the limitation of the traditional dipolar dephasing method, which in fast rotating solids is disrupted by rotational refocusing. The proposed approach can be used for quantitative measurement of carbon aromaticities in complex solids with poorly resolved spectra, as demonstrated for model compounds. (C) 2012 Elsevier Inc. All rights reserved.

URL<Go to ISI>://WOS:000310650600003http://ac.els-cdn.com/S092620401200077X/1-s2.0-S092620401200077X-main.pdf?_tid=ed5995a0-3e4c-11e2-acec-00000aacb35e&acdnat=1354651269_ec4473cfc54060aa82cd250e9f5bb731
DOI10.1016/j.ssnmr.2012.07.003
Alternate JournalSolid State Nucl. Magn. Reson.