Abstract
The structure of two Torbanites at different evolutionary stages was investigated using solid-state 13C n.m.r. spectroscopy with high-power decoupling, cross polarization and magic-angle spinning. To follow the structural changes occurring during pyrolysis, the residues after 400 °C heat-treatment under helium flow were also analysed. Using variable contact time and dipolar dephasing experiments, an estimate was made of the relative proportions of the different types of carbons (saturated and unsaturated) and the percentage of quaternary carbons among each type. The results were compared with data from previous studies using FT-i.r. and volatile product identification by g.c.-m.s. The reliability of the quantitative determination of the relative amounts of the different carbons and the relationship between f a and H C are discussed and, in one case, the polyaromatic unit size has been evaluated.
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