Abstract
The NMR lineshape and spin-lattice relaxation time in solid cyclooctane have been measured from 50K to the melting point of 288K. Considerable molecular motion occurred in the two upper solid phases between 166K and 200K, approximating to quasi-isotropic molecular reorientation; no simple motion of a restricted type could be found which accounted for the very small lineshape second moment of 1.50 G2. The activation energy governing this motion was 3.7+or-0.3 kcal mol-1. Above 200K a further line-narrowing occurred due to molecular diffusion and the diffusion rate increased sufficiently with temperature to allow the process to become an efficient relaxation mechanism just below the melting point.
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