Solid-state NMR experiments on hexane-1,6-diyl bis(
p-nitrobenzoate) and its 1,1,6,6- and 2,2,5,5-deuteriated derivatives present a coherent view of the molecular dynamics of the central alkyl chain. The techniques used include 13C CP/MAS spectra, 2H quadrupole echo spectra, associated with measurements of 13C T1ρ relaxation times, 2H and 13C T1 relaxation times and quadrupole echo reduction factors. Molecular dynamics in the central chain are dominated by librational motions at the CH2 groups that can best be approximated by a six-site conical model. The activation energies for these librations are ca. 35 kJ mol−1. gauche–trans flips in the chain can be ruled out as the origin of the effects observed.
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