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Measurement of dipolar couplings in partially oriented molecules by local field NMR spectroscopy with low-power decoupling
Authors:Malgorzata Marjanska   Franca Castiglione   Jamie D. Walls  Alexander Pines  
Abstract:Low-power phase-modulated Lee–Goldburg homonuclear decoupling was used to record PDLF spectra of fluorine-substituted benzene derivatives dissolved in nematic thermotropic liquid crystalline solvents. The low-power decoupling minimizes sample heating during RF irradiation while still achieving highly resolved PDLF spectra. The method is illustrated by recording spectra for 1,3-dichloro-4-fluoro-5-nitrobenzene, 1,3-dichloro-4-fluorobenzene, and 1,2-difluorobenzene dissolved in different nematic solvents.
Keywords:Liquid crystalline solvents   NMR   Proton-detected local field   PDLF   Phase-modulated Lee–  Goldburg   PMLG   Heteronuclear spin–  spin couplings   Multiple pulse sequence
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