The Influence of Polytypic Structures on the Solid-state 13C NMR Spectra of n-Alkanes

Two polytypes for the monoclinic (M011) modification of n-hexatriacontane (n-C36H74), single-layered structure Mon and double-layered structure Orth II, were studied by means of the solid-state CP/MAS 13C NMR spectroscopy. The terminal methyl carbon showed clear differences in the chemical shift as well as spin-lattice relaxation time (T1) between Mon and Orth II, in contrast to no marked difference for the other carbons.