Abstract
13C cross polarization/magic angle spinning (CP/MAS) NMR spectra of stearic acid with the crystallographic form C, deuterated the methyl and methylene groups besides a proton in the carboxylic group, were measured as a function of the contact time, in order to obtain the cross relaxation rate (1/ T CH) between the methylene carbons and protons in the compound. From these experimental results, it was found that the 1/ T CH values for the methylene carbons are proportional to r av −6, which is the averaged atomic distance between any specified carbon and protons. This means that the CP experiment provides a geometrical information using the partially deuterated molecules.
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