固体高分解能核磁気共鳴吸収法 (CP/MAS-NMR法)

抄録

Carbon-13 nuclear magnetic resonance with cross polarization and magic angle spinning (CP/MAS ¹³C NMR) is reviewed with emphasis on application for coals and their related matters. After the brief introduction of the fundamentals of CP/MAS ¹³C NMR experiment and additional pulse diagram, the quantitative reliability of f_a (the fraction of carbon that is sp² hybridized) is discussed.
Conventional CP/MAS ¹³C NMR and newly developed Dipolar Dephasing experiments for coals are also reported, and it is shown that the former can yield fa, but the latter can discriminate between the protonated carbon and the nonprotonated carbon, and hence, permit a significant increase in the amount of information in structural analysis.