Abstract
To advance our understanding of the 13C spin−lattice relaxation process and rotational dynamics of C60 in various environments, we have acquired relaxation data on this molecule in chlorobenzene-d5 as a function of field strength and at various temperatures. Field-dependent measurements allowed us to separate the contributions arising from the two possible modes for relaxation in this molecule: chemical shift anisotropy (CSA) and spin−rotation (SR). The CSA and SR values were used to extract the reorientational time, τc, and the angular momentum time, τJ, which allowed us to investigate the rotational dynamics of C60 in this solvent. We found that the longitudinal relaxation rate is dominated by the chemical shift anisotropy mechanism and that spin−rotation becomes rapidly more important with rising temperature. This is seen especially at 4.7 T, where SR dominates at the moderate temperature of 333 K. We also compared our field-dependent findings with values derived via the Hubbard relation, and we have ...
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