Low-Power Decoupling Sequences for High-Resolution Chemical-Shift and Local-Field Nmr-Spectra of Liquid-Crystals

TitleLow-Power Decoupling Sequences for High-Resolution Chemical-Shift and Local-Field Nmr-Spectra of Liquid-Crystals
Publication TypeJournal Article
Year of Publication1995
AuthorsNanz D., Ernst M., Hong M., Ziegeweid M.A, Schmidt-Rohr K., Pines A
JournalJournal of Magnetic Resonance Series A
Volume113
Issue2
Pagination169-176
Date PublishedApr
ISBN Number1064-1858
Accession NumberWOS:A1995QW15800005
Keywordsdipolar
Abstract

Various new and well-established multiple-pulse sequences that provide homonuclear dipolar decoupling are compared on a high-resolution spectrometer/probe configuration using low RF-irradiation powers. Proton-proton decoupled carbon-13 spectra of singly C-13-labeled benzene dissolved in a nematic liquid crystal and of the liquid crystal 152 are presented. Two classes of multiple-pulse sequences are studied that produce either broadband decoupled carbon spectra or separated local-held spectra. Several new approaches for the design of windowless sequences are demonstrated to be valuable in these heteronuclear experiments. They include implementations of the iterative MLEV scheme and the use of 270 degrees pulses. Furthermore, noncyclic propagators have been found that exhibit advantages over closely related cyclic analogues in both classes of decoupling sequences. (C) 1995 Academic Press, Inc.

URL<Go to ISI>://WOS:A1995QW15800005
DOI10.1006/Jmra.1995.1077
Short TitleLow-Power Decoupling Sequences for High-Resolution Chemical-Shift and Local-Field Nmr-Spectra of Liquid-Crystals
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