A ¹H and ¹³C Solid State NMR Investigation of the Structure and Molecular Dynamics of Hydrogenated Oligocyclopentadiene

The structure and dynamics of hydrogenated oligo(cyclopentadiene) (HOCP) was investigated by means of ¹H and ¹³C NMR in the solid state. The ¹³C NMR spectrum of HOCP is reported and interpreted for the first time here. Quantitative information on the distribution of the different structural and diastereoisomeric environments of the cyclopentane monomers was thus obtained. Moreover, the dynamic behavior of HOCP was investigated through the measurements of ¹H and T_1p, and T₁, as well as ¹³C T₁ relaxation times, highlighting the presence of two major motional processes, whose specific nature is discussed. Quantitative dynamic parameters were extracted by applying suitable theoretical models to the ¹H T₁ curve vs temperature.