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The dipolar and the spin-rotation mechanism are both involved in the relaxation of the 13C nuclei. Their respective contributions are evaluated from the nuclear Overhauser effect in the presence and absence of Cr(acac)3, and confirmed through the study of the temperature dependence of T 1. The molecular rotation appears to be isotropic, and to proceed according to the Debye diffusion mechanism at 296 K.
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Grandjean et al. (1973) studied this question.
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