Figure 28
2-(2,4-Dinitrobenzyl)-3-methylpyridine-CPMAS 15N NMR spectra (centreband regions only) for the enantiotropic EI-A and EII-B phases of 2-(2,4-dinitrobenzyl)-3-methylpyridine over a range of temperatures, increasing from bottom to top. The two independent lines originate from 15N substitution in the two independent nitro groups. Parallel 13C spectra, which are not shown, led to the same conclusions. Adapted from Schmidt et al. (1999). |