Ap. Legrand et al., C-13 NMR SPECTROSCOPIC CHARACTERIZATION OF PRODUCTS OF SOLVOLYSIS OF COALS BY N-METHYL-2-PYRROLIDINONE, Fuel, 73(6), 1994, pp. 836-839
C-13 solid-state n.m.r. was used to characterize three Polish coals an
d their solvolysis products. Analyses of protonated and non-protonated
proportions were performed with dipolar dephasing and similar methods
. Mobile phases were analysed through proton T1rhoH measurements. The
relation between aromaticity factor and H/C atomic ratio is discussed.