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- W1972144611 abstract "Combinations of 13C magic-angle spinning (MAS) NMR experiments employing cross polarization (CP), cross polarization-depolarization (CPD), and cross polarization-depolarization-repolarization are analyzed quantitatively to derive simple and general procedures for optimized spectral editing of 13C CP/MAS NMR spectra of rigid solids by separation of the 13C resonances into CHn subspectra (n = 0, 1, 2, and 3). Special attention is devoted to a differentiation by CPD/MAS of CH and CH2 resonances since these groups behave quite similarly during spin lock under Hartmann-Hahn match and are therefore generally difficult to distinguish unambiguously. A general procedure for the design of subexperiments and linear combinations of their spectra to provide optimized signal-to-noise ratios for the edited subspectra is described. The technique is illustrated by a series of edited 13C CP/MAS spectra for a number of rigid solids ranging from simple organic compounds (sucrose and l-menthol) to complex pharmaceutical products (calcipotriol monohydrate and vitamin D3) and polymers (polypropylene, polyvinyl alcohol, polyvinyl chloride, and polystyrene)." @default.
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- W1972144611 date "1994-03-01" @default.
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- W1972144611 title "Optimized Spectral Editing of 13C MAS NMR Spectra of Rigid Solids Using Cross-Polarization Methods" @default.
- W1972144611 doi "https://doi.org/10.1006/jmra.1994.1048" @default.
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