Abstract
Rotational correlation times for triptycene and 9H-fluorene in chloroform-d1 were deduced from carbon-13 relaxation data, using bond lengths predicted from infra-red stretching frequencies. In each case the situation is over-determined in the sense that there are more measurable T 1's than independent correlation times. Deduced correlation times are shown to be sensitive to the variability of C-H bond lengths. The results for 9H-fluorene are discussed in terms of the slipping boundary hydrodynamic model.
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